Malicious PDF — malware analysis report

Static analysis result for SHA-256 4025876defdd6f22…

MALICIOUS

PDF

87.3 KB Created: 2021-06-14 23:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 76ef1088feac927d43344568ffd64b4f SHA-1: 61a4cde255ef5dcace3766f1ee2368e6970bce87 SHA-256: 4025876defdd6f22f35b250224cb0b0c7a232b8d527e01e99b717299dd84f137
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8200

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=bangla+new+college+sex PDF link annotation
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/dofewubabowixubek.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/geniral.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2332565016037e1b1b58cb8e95c4299e/88433870785.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5a7363ba4034284524ea106aaeaf7878/79786407262.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160876eedb7dee---ruminanivezizozekexu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b3311ca4---84490527762.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/ditototamevopozew.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086899171a31---75409843195.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca06d98e5---86251159795.pdfIn PDF document text
    • http://yuha.be/_files/file/gabukosedom.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/29569547332.pdfIn PDF document text
    • https://kumsalgame.com/calisma2/files/uploads/78751109461.pdfIn PDF document text
    • http://fittbikese.hu/files/file/93647063219.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/3i0iq4td7lvlp153dh47rm26bv/metezipisaxowenezeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 7200 bytes
SHA-256: a217c0b2b509d8695ed5d2f6a67962dca48cf5013529c3479f60b74c9e4fa554
font_01_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 4740 bytes
SHA-256: 16c77ad7723daeea8255f83de3041b3b623d60b55c16a6f02a34684a08c673c4
font_02_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 9452 bytes
SHA-256: b4085e282b916f4794decf18bd94adcd9056f6d858d673977c5d7a5e60970d3d
font_03_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 10480 bytes
SHA-256: 2692d19dd5a3aa134e939ec9a0818ec12f4957135c407b03d3166c228985f49c

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