Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf07db2f449591c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-09 23:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ace4683a924728cc1d6c0eaaaf9b4520 SHA-1: b028c872a1b7e8eb57fbf8e191d369a9aa984f8f SHA-256: 9bf07db2f449591cd4dd5595e632d25a69c4e830e3e0c6afea1a5a0de9e3952b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs, many of which point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive link farm points to a common tactic for distributing malicious payloads or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131be01d34d5---betometuvinegetesudisune.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2601fa9143473ebe4e4516c9cf487c25/56110346413.pdf
    • http://fasson.vip/images/editor/files/kevaliferaduridovujevebut.pdf
    • http://japan-railpass.info/images/blog/file/jejij.pdf
    • http://adriennemason.com/assets/files/wokatapazovikavogezas.pdf
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/67409788562.pdf
    • http://thedreams.cz/files/setebanepesulifovek.pdf
    • http://wellogo.in/userfiles/file///67329268174.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/gidiniredagosigufatafa.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pjvgcj2c8867e571r3as7q2r0a/19417813105.pdf
    • https://myclubowners.travelenvogue.com/userfiles/files/82087376445.pdf
    • http://tomekorea.com/userData/board/file/94916885106.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/s919nstb6vai6hmaf6mljp1rs9/11023113481.pdf
    • http://hoilhpnqbthanh.com/upload/file/dirimodare.pdf
    • https://nikunjfoundation.org/ckfinder/userfiles/files/79870553089.pdf
    • https://pacie.vn/web/uploads/files/furilorofefurowi.pdf
    • http://abwlanham.com/uploads/files/sorelowakajomubajevob.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/dabunutedogorajijo.pdf
    • http://matsusushionline.com/uploads/files/73701097715.pdf
    • http://ansing.nl/userfiles/file/42028662502.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/wubija.pdf
    • http://vnndt.com/Images_upload/files/redemidu.pdf
    • https://shatalarab-llc.net/userfiles/files/44004847410.pdf
    • https://virtrade.gr/userfiles_lybo/file/69153422275.pdf
    • https://pvesc.vn/uploaded/file/pibofu.pdf
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/lozevotiwi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+galaxy+note+charger+not+working
    • 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_off0000beb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB7 16792 bytes
font_01_sfnt_off0000d6ce.bin
bd1080b0b2f38c82a89f4e0571364f827d981daa4de510e204497c8a6e0cb418
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 11244 bytes
font_02_sfnt_off0000f10d.bin
9a3667bbfa406dcb764444002a58d2e97899e7b4596feb72af66662485cd4c9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16800 bytes