Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a627b079a837ad9…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 14:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f26d9f45ad2ec0ca26c0bb315cc4351c SHA-1: fcbb818f34c1b64d4090d7e53bfd628b4ca716ca SHA-256: 3a627b079a837ad9e19e9a587219e8d6c2ffc8aa4c24c0b2481285dd77da93d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier as malicious and detected by ClamAV as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content. Although no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the callback lure, indicates a phishing attempt designed to trick users into interacting with malicious links or calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • 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 https://hinodecoder.com/userfiles/file/xezipiruju.pdf In PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/mawuwatojeka.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613366636905e---perode.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/raxitakafasokuxerenovifis.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161320892231fd---roniturikemokuzagakefi.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/nofufabo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8957271095335748dfe2976eb21e564c/kibuwa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc9440e8b---rebenubifuganujumoroti.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/71855960491.pdfIn PDF document text
    • https://onlinendttraining.net/files/vibekimugoxunonu.pdfIn PDF document text
    • http://ingore.cn/upload/files/mepavadide.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fugidazunoxusovalazuvol.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/64208370028.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/jomiduwisa.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bc3385ab---68368988295.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109132318242379.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/newub.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/23013141914.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/14272652141.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/risaga.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/tomovobekepuwejomazapu.pdfIn PDF document text
    • http://huiking.cn/uploads/file/021125062235.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/96351662855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=displaylink+driver+for+androidPDF 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_off0000cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 17676 bytes
SHA-256: 338b4a7958e0a86bad202696c8ed209f34d2a45607a6a0810638c7875a341cff
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 10664 bytes
SHA-256: ce7e37e49cb97273cffa9000d0c4c3e88f447533da7fd19d0728b88eee545524

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