Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d6122f52d30a6d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-02 20:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 999275cab8161a42f3f5cd62942d2eae SHA-1: 18d3777d422b3dc742c66fc679766e22867bc2f6 SHA-256: 78d6122f52d30a6d6d49f5be81ac95dddb5a12fc86e0ebacbe4f715cc49cf1e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns point towards a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.dkmodels.net/ckfinder/userfiles/files/53804135367.pdf In PDF document text
    • http://sl-light.ru/design/img/upload/file/fitobazafigefewiwidaviso.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/sogajufilir.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/linezirejenafir.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/54496956823.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/jimodikomenuxatu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fumif.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/wodalilenike.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/womifivarisemaruvotutufed.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/58a444cf3a389bd16fdeae415e5a8bca/gapunepitanomubebimef.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/16740194890.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d55bd8cf8ff1b4c2882dd264c303e4b4/gilunupoxutipe.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1fe21919---44851062123.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cc01880c9d12f3aeed55b44e1b21982c/29020667563.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/fixijefuxokidesaxotef.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a477f48e2c---vinowuvafesapozuxipanaxon.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/kibidudijof.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2276251264.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd3271955---najatopenabakos.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/j7tn92djpmo03fqas5dhfepl81/zalazediwomeju.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/kiamuulqt1c2kna7olg08fe0q0/5961676210.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wafazepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=when+i+grow+up+worksheet+printablePDF 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_off0000b2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 10940 bytes
SHA-256: 7c45b80e3cfbf35c30f13b2d42bc10ce85cdc036af7d7588358dedfb5d856b65
font_02_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 14628 bytes
SHA-256: 1d9303529438f44583379bb75cbaac9a1f86e82c26ec01b22b75b796edfa4fc4

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