Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2130b7174d5e05c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 01:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cba0921f6bce6d3b2b31d06c3b8c1b62 SHA-1: 0b0738180b337b7b07a5bc169f17d6306f241ffe SHA-256: a2130b7174d5e05c5c9aa0988c3652f37fe9c39cbf71aa23f39df4d356b6acd0
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'SE_CALLBACK_LURE' indicates the document is designed to trick the user into calling a phone number, a common tactic in phishing and tech support scams. The presence of embedded JavaScript and the nature of the URLs suggest it may download additional malicious content or redirect the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=c%23+radians+to+degrees PDF link annotation
    • http://titibbs.xyz/js/ckfinder/userfiles/files/13376896949.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/f03tgsfqo6btchtskorco05pkn/juloke.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/f82667umjkpi29vtvrjfe6e5ok/fetadabovodadol.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/94660440415.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/30031267832.pdfIn PDF document text
    • http://esejsc.com/upload/files/95707982456.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/72912863052.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/sagute.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/26744905433.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/ruwilogit.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/kajulexetodi.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/14294547330.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/betipolosibetaj.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210901170321559346.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58365703047.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bl4fgohn656obuqanvh9q13p6g/91508349928.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382abb8bfb3---68920787511.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1796714249613639ab8648c.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cp155cj8se7p6h85ecpog1g2og/57515152784.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/85226666441.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/n32q5ue1du21bb05940d97t9d2/18047612458.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/14106072101.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210905205315.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/ziloka.pdfIn PDF document text
    • 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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 18592 bytes
SHA-256: e36ba595e2e73d08a1b1691928e99392da881ea1733579587bd88d99b76549ef
font_01_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804

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