Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b1c73ba100253d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 03:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 449d05020683e88facb7144dffad3b4b SHA-1: 05d6818802c2d1f3778e15e2780e956f04d19dfc SHA-256: d3b1c73ba100253df554b44aa80b41df6d7c6b458cbd216a98a361d6f743d78d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. It contains numerous links to potentially compromised websites and a link farm designed to improve search engine rankings, suggesting an attempt to distribute malicious content or redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the callback lure heuristic indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://jcmimoveis.com/userfiles/file/60610054524.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18dea1c33---debawegumelewenutitalole.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/mobukigudugu.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/82525944496.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/pugoriwodewurabi.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/29608872831.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130765cb52a9---71485219943.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ac8cc2e6ffae658471be0fb0dd91f33a/75337291531.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/72464522980.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/kovifisebipulepanavifipa.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/xugadekonajep.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/70570115964.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/84599775592.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/20404010402.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/k94vnt7mjg9b710tuvhr9l77md/finonazudezibuvapowogo.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/samexutasuboza.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/26880550346.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/filelibejotibo.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/28269796730.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0392256ad523160c8289f3103db0b92c/65906461683.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/pegabosejukawavikanog.pdfIn PDF document text
    • https://posh.hr/files/peligasimimibor.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a71cfe5c90---xirududotajubuxime.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/devozefududimesugiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=xnspy+apk+full+versionPDF 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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 10632 bytes
SHA-256: c0bcc9dfba42aaaed7ce20ce456b7819e44019bda3e17cf2e26e1ede042f06eb
font_02_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 18276 bytes
SHA-256: 8c5ec79ea5149f3c45e909f310d89959dbce773013e30b9bd760ca638c710676

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