Malicious PDF — malware analysis report

Static analysis result for SHA-256 73504cf7c018516c…

MALICIOUS

PDF

87.4 KB Created: 2021-08-12 04:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6819c86770333887a2417de6007662e0 SHA-1: 9300b3c2fe74f3f343848b7e9cdd240feec656a0 SHA-256: 73504cf7c018516c2d4324ad830ecc7df1b80de6efef6bf01413d026415c0e86
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://gagiongvitgiong.com/ckfinder/userfiles/files/kefigi.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89500365e9---dugiwixolotedanemubof.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/1623159809.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ccc0a237df419c066c739974e0144367/lejipefuxowijamizubaxoxiv.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abab96cada---bemifiwemelureper.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b451277dfdc---22498689405.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/40830135720.pdfIn PDF document text
    • http://ashioke.com/images/library/File/tufaforajatubazaxepugawez.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54a51cf8c---81624599748.pdfIn PDF document text
    • http://lucann.com/Upload/file/vizopitanusowugixar.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/99093304692.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806cf658af5---luzagad.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/vijegesuxewidono.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/fuvigafikunaninenu.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/1157072868.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad25c41ad2---68657203510.pdfIn PDF document text
    • http://3sdent.com/upload/files/zitigamekiviximatu.pdfIn PDF document text
    • http://wohingltd.com/userfiles/36769395907.pdfIn PDF document text
    • http://beta-rc.com/upload/files/woroxefegupevop.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/mizaxilelozewafe.pdfIn PDF document text
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/37438432829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+a+ti-84+plus+silver+editionPDF 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_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 17520 bytes
SHA-256: a66c9b177216bbfdf8d8126c8bebdb0fdf795e58410f949f0b93a44b065902a5
font_01_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 10948 bytes
SHA-256: 611e9098f10c206d9949bab3a3560d2e992762f392517a4d6f6c40a1f3b9545b

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