Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa7ec1aeea95fc5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 11:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ea5a6e03271f20a890ad2a2ae41def7 SHA-1: b1abfcd982c01f2c75068f045470442211fb8704 SHA-256: ffa7ec1aeea95fc505373814fd4f2aaa1599d29b4a2cc00a32a2aa50435defb9
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of QR code and callback lures suggests a multi-faceted phishing approach. While no scripts were explicitly extracted, the nature of the heuristics and the ML classification strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sieuthihatgiong.vn/webroot/img/files/41122838594.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78c4e1863---kugagiwiganipifuwebe.pdfIn PDF document text
    • http://www.polni.si/Images/files/gixepa.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/totukifurepelak.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/5533038588.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/dilobunewijiv.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/46236426136.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/97408350077.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/xawufoxagafujogakise.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/96758352121.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/52337726418.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2af4d0e9---13946124158.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/felezi.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/doresadofuxex.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/famarifabiwutuputes.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/zekipo.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/mebowitavebe.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/nipexobijirubepefotu.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xigelopativolakebubapekas.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/47890385474.pdfIn PDF document text
    • https://eslms.com/userfiles/file/vokoruvowulojezujusi.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/49102583970.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/93735826135.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/632dbc7b4a38b8bde4d2d54dadd60680/furimoboruna.pdfIn PDF document text
    • http://snsi.jp/image/news_file/kadanewovatosazel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+scan+code+with+phone+cameraPDF 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_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 17956 bytes
SHA-256: ca60d870e5126a6b7f833310ea520869da1584167034ff19fd9b8623fdc68356
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 10808 bytes
SHA-256: d5c5586b9822a72f1895788484ad193ad860a24d7cceadb235ceab638827c460
font_02_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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