Malicious PDF — malware analysis report

Static analysis result for SHA-256 05129de3485bd2f3…

MALICIOUS

PDF

86.7 KB Created: 2021-07-29 19:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 84455b7d4690eb666cae2c5f8b9b65af SHA-1: 1d80565e30b5cfbe5bcd26a42d5797add67e6348 SHA-256: 05129de3485bd2f377131e37a67a5e9fb176171f641e40a50e335b8988ba034a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://smidgel.ru/uplcv?utm_term=brookstone+active+pro+earbuds+reviews PDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3aee4dc13---begeneli.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bb36a87c0438a8e19638d6392c093638/92130066409.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/verufoti.pdfIn PDF document text
    • https://egca.fr/userfiles/file/korululunapugezo.pdfIn PDF document text
    • https://abeess.com/userfiles/file/30517929406.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/telisodug.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ff2b6a7c7ab1aa686b81179cfb9e7ab2/dawurum.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/68052158577.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/mexemuwenetupag.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad661858cee---kileriragifawelomimagup.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6558e20fea---rerax.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/ruguwititobimobugidivakox.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/xosevapufelogufo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd7b11f302---jafemeruxirewanezo.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077341a71911---72401471726.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/jovaxaf.pdfIn PDF document text
    • https://mashura.co/userfiles/files/1549380446.pdfIn PDF document text
    • http://ruresept.ru/files/file/zomegapefevinusa.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5f71402f1---sawonug.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16210964264536.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/jirezinanefugasiribexi.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/bavuzefutedolamovolus.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/nupanubiwonetijadunoxif.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cei02h6cmba0bms9t6falhnkgv/zuxizonomuwukopobexeside.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10996 bytes
SHA-256: 12abec097c547f0b7a961e820860f74598cd5edc0a73181759dacbfdb6087812
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 17228 bytes
SHA-256: 89a2465762590f2706fe6844fa667943193734cfe52e931776d925edcaae0a55

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