Malicious PDF — malware analysis report

Static analysis result for SHA-256 a738c1f4bf055431…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 00:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 618c579a825f8af2a5f94b1beef078b5 SHA-1: 64cb49323ae2240f588a993e9d7eae87cb1e11f9 SHA-256: a738c1f4bf0554317187bbd082edadc366594654988386b9f92bec6aed31ef16
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Multiple heuristics indicate it functions as a link farm, directing users to various external URLs hosted on potentially compromised or disposable domains. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=baby+crawling+with+one+leg PDF link annotation
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/29253297519.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/kv06scaothulocracsequuifm3/lebakod.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ad48361e---71480668357.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wisevulewupijereke.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/kipesimunikixujinam.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/gatepuzotoraxodezifedipi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d25bfdb56cba90f72a3fae69bbf3abcb/85703992776.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851843c6860---lejusafidiporem.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cda588d80---12949193359.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59aa915a1---21411811650.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/28814815707.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/66325682031.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072011c82056---37831492982.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/nmjoeso5ki5ib763gtnil5p24p/19372290624.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcb2a75ec---82238720550.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b95b617b8---sodimawofitamulib.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/pivolededewopipivunomibeg.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/61fn7je5370isvrfradn7o03i4/31982509184.pdfIn PDF document text
    • http://orrizon.ru/images/file/lakevinadaxilizuvabamim.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608fb4329f182---64081773925.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/karokutamisavaloxos.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901e16b7e96---xuwimuwifitixud.pdfIn PDF document text
    • https://triosms.com/userfiles/file/30835362002.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fab9e80ac---topuvimujalezigi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f594564f8faec1579a7d9606e142cc3f/wutukol.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d3593292---fuworawaxeviwoxove.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 16380 bytes
SHA-256: 0061e97fd72a2599fab7b94d3e2f38f875f80f9dafec3b8174212adeae23d2ae
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 10732 bytes
SHA-256: 1cda78f4fdcff2b93f6c503e3b801b118ccb66573afbd9e30eaef10719e618f3

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