Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82e85fc63bcc24c…

MALICIOUS

PDF

97.1 KB Created: 2021-09-07 10:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 831a89c7662c1aefbdd5228885198a65 SHA-1: 354d568da77e5053b1cadd62e44ff0d3f95b3bea SHA-256: f82e85fc63bcc24c4345595032ad961dc935c80dae76abde172c76c08c541c89
156 Risk Score

Malware Insights

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

The 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 URLs pointing to compromised websites, some of which host further PDF files. The presence of multiple 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests a tactic to distribute malicious content through SEO poisoning and compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://triosms.com/userfiles/file/mosedoxelidizesopob.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/39216d98dbe70d1380453a279444fc16/32712387087.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/13117346193.pdfIn PDF document text
    • https://tekmaker.com/upload/files/58806332534.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796976c8fa---64698825011.pdfIn PDF document text
    • http://otczenacts.com/media/files/pinaforimoki.pdfIn PDF document text
    • http://sciattella.net/images/file/pinobawujepadimizozuraj.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e824dc86---nuwojikomukajopupise.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/jixopexukuveriv.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6ae3697beff24518224f09700e078b78/23975336141.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/62184577049.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/71135424515.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1728e6e957b2fa08fc25541c6b399856/40484284251.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49f4871fa2---tametufobotazajunili.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/56825420237.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/8016307918.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39289b5e2---63978034750.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210727224440.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/tesazedevupat.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/msde05lo9n0aold3vhdr634om7/rezalibaseviwakorale.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/sesafusufuf.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/72015334031.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/wubiki.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/f2ee51f7a645fbc478bf3b0a8102d02c/kebexob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=oscar+awards+2019+pdf+in+teluguPDF 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_off000112f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 11348 bytes
SHA-256: aeb539b0aab6e5174edcc756218f0fea6a4febeafcd8f9d1341da955a73312e8
font_01_sfnt_off00012dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DD 18804 bytes
SHA-256: 7f498038780b85518027d0516f31d0d1c0c314479992c2e6155016fed5ee8f13

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