Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fd2f40cd2f3948…

MALICIOUS

PDF

86.0 KB Created: 2021-07-01 16:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 387a229972adea3c23f9b3a8e4d599ce SHA-1: d20829ea9c408562164fefcd082d9b595288b38e SHA-256: 27fd2f40cd2f39488eb5f333484c2525cee820043b435df968d4773ebacdf31a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, designed to lure users to malicious content. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://tanasiri.com/piceditor/file/69843334769.pdf
    • https://fanaf.comarticle_ressources/file/julalejex.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e633568b33d82162ba6c80f896cc3adb/pilitegowisefuxexodole.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13be1a0cfe---tigupujike.pdf
    • http://hi-techfiber.com/userfiles/file/wugibizowiwokuja.pdf
    • https://dock-levellers.com/upload/files/gadatogonepatumasavavowun.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/af3bf11c355ce9e2c59f230b0b0101f3/nujeludivakagifigakovanaz.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/26586714246.pdf
    • http://modellszerviz.hu/userfiles/file/94617167117.pdf
    • https://agrilaui.com/userfiles/file/58249378853.pdf
    • https://aplusadvance.com/naver_editor/data/file/gurarotulepegugevisoka.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a76a0aa13c---90413105029.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1e9d61cd---malofoxizudow.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd096d5f9---lekedivazujovate.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f637a2b86---39422308529.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e87673dea151116ad597bc3027d90d00/kemarokukelivosabakaf.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/unbe53fnnhpohvpoa4m3de7nlq/5821288624.pdf
    • https://bestcoloringpages.com/userfiles/file/87544936263.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5a07057bc3337cc0add3da8137609a9d/20291531985.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160748926130a5---wuzukagesidizajew.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4eb3f2cd80---bunedofutupujanup.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c2aa90c82---70285869416.pdf
    • https://wsbtitan.com/images/file/93344414055.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608874d7a4b9e---69837086608.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/38fbc258e56fdfbf9eb195ab659f75be/35020220178.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=undescended+testis+position
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 16792 bytes
font_01_sfnt_off00010713.bin
7e2522df35396d4d34b70dc19dfda9b7aec83f36ee1125ac23ad57b432967c23
pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 17260 bytes
font_02_sfnt_off000133f5.bin
3d167d7c4c7ebf38ff3f01a0555b0546d17766538cca2297edf0f111a911f2f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 10208 bytes