Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6a2ffa560e8744…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 16:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6738c69eacc8eb3344e9048875aeb42 SHA-1: c6aed01700e8e0dd44bd017ef9fbddcc3c70d1b9 SHA-256: 6a6a2ffa560e874492613babf8d931aef11359ad72e7e5da9dee6aa3408ef148
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a pattern often used in phishing or scam campaigns. The heuristic 'SE_PAYMENT_REDIRECT_LURE' specifically indicates that the document describes new or changed bank instructions, a common tactic in business email compromise. While no scripts were directly extracted, the presence of numerous external URIs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://allaboutdowney.com/userimages/82961488624.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/baalnkrbf5m6i7sr7j718g05hs/61479652075.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/51f56f4e93a86c052037c6c19759e25b/xevurolamalejixisigiv.pdf
    • https://alutat.com/data/file/koxefe.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/4gtd3rl7206t027uvmd8m4lubs/2404677777.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/dilevozutevobil.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608076b44a7ee---18789335345.pdf
    • https://bisnismedsos.com/userfiles/file/50108195858.pdf
    • http://sdds.be/userfiles/file/21568086575.pdf
    • https://stalbeckers.nl/userfiles/image/file/vopevukali.pdf
    • http://dolphinegypt.net/userfiles/file/zojagul.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adee8d80d2a---debimigiso.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf057854cef---jisevanoxatuvoludujemogo.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f3dfe0bab37ca42be6802f470b95d402/9814233898.pdf
    • http://markone-tools.com/upload/files/xejogexer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pubg+download+apk+and+obb+file
    • 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_off0000e410.bin
0f16479db0a40e9709731bb036abfb232f7cea701cf7cb9538cc9d9b2f6fd126
pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10724 bytes
font_01_sfnt_off0000fc66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 16792 bytes
font_02_sfnt_off00011478.bin
48a2ea264794a0caffade4597e4097c29e5b8ae841112d5158c064f8d3382434
pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 18108 bytes