Malicious PDF — malware analysis report

Static analysis result for SHA-256 feec01c8309f6442…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 19:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61a2a5234207e0759d6f02e0be314e92 SHA-1: b35f112b8dd70a6f24055cbdbbb9e3647da698a0 SHA-256: feec01c8309f64421a58c90ffdc7ba3759270be635c384e25600a98f3218893c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24887d705---13237936995.pdf In PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/7205734650.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/21719920713.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/wibetedelajexokowunoz.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tesesinefibuxujagekavog.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2gbcl8ugbt3l8fmtoiv6qlm0i1/9474655570.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/39fj9vhc7u8mduv5gclsadknit/38413675787.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/vegonisev.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4a74fb09---bididalezudol.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/pixobutifawilavabes.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/80285468701.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/67940130903.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/nuvibibonugokizovovamidek.pdfIn PDF document text
    • http://fittbikese.hu/files/file/57007347957.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/67775762629.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc3a90ad3---79882124297.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0fbde7b61---rifixok.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uc072dst8v8vdnmgodd7tlufu5/58134410167.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/3705228512.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/14056954109.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f795db486f32b0ab8a7106e41f1c52d5/lelinapagele.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/gemiminotidotufip.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/pudeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nine+hours+to+rama+book+pdf+free+downloadPDF 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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 18796 bytes
SHA-256: 00b1637a8fac69a44d8af05860f31fc9f0fa585d0ab60fd0e867782468d3ad5d
font_02_sfnt_off00012e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 11156 bytes
SHA-256: 3348e15e4ed23850b3b656c35ae44ea715d3e103d116edcd114f741f6098c287

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