Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b525f06973517ba…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 00:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 551a70e40682578f1f4d474e016258e4 SHA-1: b5bc44d7ca03f3f366151e4a14c3ad56201f7219 SHA-256: 6b525f06973517ba202e3b79c1c10c44443299eb8bea2022b493023914742786
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and the compromised CMS upload link farm indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=biological+sciences+review+pdf PDF link annotation
    • http://ankamet.com/userfiles/file/86226531275.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/gegifo.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7a12bd65---daxazopasel.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bd7b17ac---12997707072.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/74749152003.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/sojopomekal.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aac614edbe91f90d38f9eacdaa60bafa/29013728984.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qqjr5d06h09u1ltfjljd90g0mv/xinafisuxosopad.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/8696199514.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/muvegobitonejinepo.pdfIn PDF document text
    • https://slide-bearing.com/d/files/19807028576.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fd424c4ff31dfaab591306026e2343d3/76296625009.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ee2474604930208dfc09149da02eca7/sozewugigopunod.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/iaoa68dchac0o4ieim9ptg3607/91952264846.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97419621d1---27231346166.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/tulonurigozobolumorase.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/6484e59e4a37fdeafa870e538ef13aa4/fajatebulekujofolijun.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/69085000011.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e19d94e07fe03b4e67ccb8de795cf975/varuxanavenakopaparevizer.pdfIn PDF document text
    • http://jonme.net/ckupload/files/saranowefemi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/c30tenu4saq3r3hp5h80vdjini/49996900073.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16129492c03c50---46378507013.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/luribaniviviponaba.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_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 10904 bytes
SHA-256: 4eb6096014d1194d18985032bf3680855509484fd01d0f0359aed0c8b2fa86e2
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 17624 bytes
SHA-256: 581356b2186e553fb7b931546dd8a53348ae15c359f6e2c2609041b9807df2e4

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