Malicious PDF — malware analysis report

Static analysis result for SHA-256 db05fa077621f7e5…

MALICIOUS

PDF

110.6 KB Created: 2021-07-08 01:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41f20a0a75e7429911b88e4110491f54 SHA-1: 5330d7d77841739becfbac417e181cd5621cefe6 SHA-256: db05fa077621f7e5a5a9899c1f3143b644bb7d8e5859ec3f0f6fde268d880eb6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves luring users to these compromised sites, which likely serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ab79198a---jijazavax.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fe11f13ca3c3a0dc0eb0ed4e5b1627d0/25010114617.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/jimezedodojibigixogunixat.pdfIn PDF document text
    • http://esistore.be/userfiles/file/mobodudomoruliziser.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9e41889bf17d94874cffc794ae6236e8/xejikafavitalevafax.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/813d3534d4d5f4966d14d7e175ef03b7/jizugerab.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1195f6d73fc1d89c363902d106f8e95b/lutuwugedokidoronazav.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607448829c5a8---7437785280.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/8309049886.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4b847a397570a04f48b39b76ae71f319/2056320823.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/92851667058.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/66851182597.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781254c8e76---60543946515.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/81431623005.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6irvj3tub4qr4d1oqgsqgfoqd0/72192579014.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819183ae23c---69748256825.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ef616529ce8a2d78e48b8438c474c04e/gozekunukuvigezer.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/89334778843.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/90431775806.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce3c75e9e---70756453385.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gopedavave.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5ec82293---6682413720.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/p5adlomn0dd00hrq9cfdrn83i0/pomevonanutoxa.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e396bed1c1---42925935618.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2d71669cfc2566b3b64396c009a09d47/romedoj.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/28c3ff4d69ece91bd3b9346a53387522/ruvigoriso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=youngest+president+everPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15136 16924 bytes
SHA-256: bf253adaa2de2128a796618b7588238dab240a4af3d68827b55327c6939415a0
font_01_sfnt_off00017d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19543 10508 bytes
SHA-256: 44b8dc25e12aacaa124ecfdd290881d950be0d15ebe561341235b9d9eb3e4240