Malicious PDF — malware analysis report

Static analysis result for SHA-256 79172af8b93f0d95…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 02:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e73f042bc3460a60e7eed2a2d1cfde1 SHA-1: d7fb75b5d2e54d11736e1a27c616d9c43ae1be6c SHA-256: 79172af8b93f0d95e6ff36938e378f2706311da5027a7ece6f15e073ed119fc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous URLs point to compromised WordPress installations, suggesting an attempt to leverage these sites for hosting or redirecting to malicious content. The presence of external URIs and a link farm structure indicates a potential phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d2d6fd5b---42444161162.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a740616a425---87471695479.pdfIn PDF document text
    • http://moneymaker-gold.de/files/vopuvew.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097508b7942e---fabenedalikede.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ee444bbddb0b824ce4cc962e0c7b1c17/4321854838.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pedoxizukukoteseparepe.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/80292706411.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/87750534445.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac45725b466---sexuzoketifusufozixi.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/79828799280.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cef0fe28de32453250564e50de23c915/nabaxubejapisoxote.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/94109344842.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021692152347733.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/pekusawiziwoxagujena.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e8d33037---8652692918.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210614043052.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/30887533954.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/20889474031.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/milolabinoxovigibu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2395f4f6---mokufixavilubipanabit.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/famip.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0c1241472b98881f9e87d0ac764a9a9f/91662503730.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/38409549631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=types+of+qualitative+research+methodsPDF link annotation
    • 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_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16364 bytes
SHA-256: 2e96bff4b9f430762317242ba2858cfacb2244acf40d3d27dfec1e0628685438
font_02_sfnt_off000131c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 11168 bytes
SHA-256: 9a1701b9ee3696806699803a765394394bf6ea9c0f268c6b9771b26b8537eef1

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