Malicious PDF — malware analysis report

Static analysis result for SHA-256 088554bf464eaaf7…

MALICIOUS

PDF

102.2 KB Created: 2021-08-05 20:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffac350c31dd48f58b3ef823104e64ea SHA-1: 942d61df2728cb8f403ab742c990687088b2c41e SHA-256: 088554bf464eaaf71dc3390d97fe47f8dde5c1e075287360995478cf658a1ac2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://barrospizzadb.com/uploads/files/mujufepibe.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a21871b06---dumisafedijufituk.pdf
    • https://mebelihome.ru/upload_picture/55342332489.pdf
    • https://faresaldabbous.com/uploads/files/daloxusuzopejalupazi.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70065b397---bibis.pdf
    • http://thedewakohchang.com/image/upload/File/756112670.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249241ec26---pisidakivonepenuragitibo.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/c22c89b9236846eb16346cb8e8cfa1f2/78211879233.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/500004edd73ebb38ed0ff245e9ab6997/58002580938.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/887d9f9b42e342a764dc1eec45a35a26/33714599067.pdf
    • http://tugrabilgisayar.net/resimler/files/wuvevaz.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/xovedudupu.pdf
    • http://aktifithalat.com/resimlerfiles/wosarez.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe99ba5a3c---vajogeg.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c0442932c0c05d5ed68945444b0119b2/ledafofebi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c539b5829---setoxipisesozaweguk.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f4e74de12---kunaradegekuziripamilu.pdf
    • http://suseefinance.com/userfiles/file/4038893792.pdf
    • https://thingstodobahrain.net/ckfinder/userfiles/files/28295103737.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9bd48689df4fe17badab49c0634d41e8/vabidavudek.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/57ac312e537fee5960602f4edf3a8693/66970514302.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=schlacht+um+mittelerde+2+edain+mod+st%C3%BCrzt+ab
    • 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_off00012398.bin
5edc273b5a14f9c1e4cfa414795bae86ffbb203a340a791ee093fb7d61c239b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 11320 bytes
font_01_sfnt_off00013dc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC9 16792 bytes
font_02_sfnt_off000155db.bin
dd8b33331e220c740e0d1b8b7d4031dbaaf4d4eeb241a246ebd375d43f7437ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x155DB 20028 bytes