Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e75496bee9ecb7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 01:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f28ac84839ba8986957eb09d0e1d40d SHA-1: 050bc005b5069319bb2f0e7eb399574adca39b7a SHA-256: a0e75496bee9ecb71cf2f349b4eb34ae2b6a73f5c766fd34eac41f05e8ec5241
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://stilna-ya.com/_userfiles/file/tudije.pdf In PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/jefun.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/12354960208.pdfIn PDF document text
    • https://semut73.com/contents/files/panoxotejewilewo.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/rapamujoja.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/fomajitadurapogaxowavem.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b211a97bb9---desopikilekixexij.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/butowapexatifaza.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/91616286840.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/sunagosikutega.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fafod.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/9909550839.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d92a869f1aca530f16d029accd48e559/resakusidotogoserise.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135c48348184---vavutudubatafixoj.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/vurosedojogesabalex.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/lunipetoguboso.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/milujamimodarusur.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/xivikufixeju.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/legivevazozoralis.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d1592b28025b32343de0b7724e9ac77f/42428602571.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kofenupadik.pdfIn PDF document text
    • http://abwva.com/uploads/files/75496524430.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/memidanututanomojezolil.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/37391490635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=blitz+bowl+rules+pdfPDF 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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 10664 bytes
SHA-256: 3a2ce9e6e818fd66db0432c419ef73bd08a82a77943123d7c792a83da5078fc7
font_01_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 17812 bytes
SHA-256: bf78c01c29ea3b1d4a85c73080255a27026a5c3deaca8c1bb11ae2edebb5ca06
font_02_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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