Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b037dcda3ab5f2a…

MALICIOUS

PDF

88.3 KB Created: 2021-08-30 06:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0ca7f9ab7126a79d5985e46f57fd25d SHA-1: 110e6e0e7b163a10f8e675812e40de4fcdf7111d SHA-256: 8b037dcda3ab5f2a935e985d6f8ef6cae060d1172941b4d0e877cf60e20a2531
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external links indicate it's likely a phishing lure or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dietmoiquangle.com/webroot/img/files/37068409372.pdf In PDF document text
    • https://batikatravels.com/userfiles/file/motuvi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/593cf734c999bb0e731912784b8b5bf4/34359821499.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/21339263371.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/bokodusosudepolisigefafe.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160716e181e0a2---14859372614.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/virexidoxosa.pdfIn PDF document text
    • http://speckrepej.com/upload/file/limesujusukozejapifarox.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/455c053d586f8a667d4128c5f3015575/gizezemapagatosozupilifad.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/tuxabeturipanegevalozole.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/93296336701.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/18532443932.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/62455568900.pdfIn PDF document text
    • https://alutat.com/data/file/podamitulixivuzoda.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/143654a03654cb289755ab9491c516e2/rumeduganeti.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/70985459.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/56355707677.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa20793514---83327734971.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/69f984b751d21541db29e586a3c88d8e/13537167059.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb62115989---71400567683.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/90584797534.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/92883758332.pdfIn PDF document text
    • http://clingac.es/d/files/32628685704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kid+interview+questions+about+momPDF 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_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 10892 bytes
SHA-256: 0a76864f9ef023dc71a4a20e68147f934ba01c8e5eb6f3402cde501e7490f6d8
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 18116 bytes
SHA-256: 34cfb7dc964ae59a1dadafb795dbefc708b5f6411d0071d9126fd23c0087cb64

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