Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0421f36f1ae060…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 08:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a16911e5b7164e32ed03c96268521c9f SHA-1: ce28da0cc5599c2bf51f9cc08f80ca80ed3f5d45 SHA-256: fc0421f36f1ae060fd3eb8064f7f80aedbccbb9479c4dfb8eb2c6a9542bf73ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary lure appears to be offering a 'python learning book pdf' via a URL on a potentially compromised domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://drafthe.ru/uplcv?utm_term=python+learning+book+pdf+bangla PDF link annotation
    • http://associazionemillesogni.it/userfiles/files/pavajib.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/87873834902.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/39747371318.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zezumudebadiwawedoke.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/39148369723.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/rizixajuwajajedunarosebo.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/35343496503.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/98363902906.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/sulirotad.pdfIn PDF document text
    • http://cjatkinson.com/userimages/25430330626.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/30490291217.pdfIn PDF document text
    • http://tipiland.net/upload/file/1082183601.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/23464049250.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/be84e5c28a19fcc7976d685a314af275/torugisilefi.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/sidiperewuwatipeza.pdfIn PDF document text
    • http://klenderbio.com/upload/files/musirumozepugax.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/xasogixukad.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b277dd8a08c74c9ad44f23ace75a933e/85701752613.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a1e311861d9b9460a827dfbd4ece59fa/diwuweridivigojitedibezup.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///82863930410.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd4d1cc8f---wiviminexoruwit.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/depanavip.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/jutid.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907050350819074.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f84910cc3bd---lubugufijutovusafedumere.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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 10956 bytes
SHA-256: d7e4fd366248a608a8c9f0d5c746c10571a835f57f1b43b6b845e31a0076d42a
font_02_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 17256 bytes
SHA-256: 4de3b9fd93628f654e5f733f67e0a94edc64e6695021bfc1f06ac498620ed5a3

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