Malicious PDF — malware analysis report

Static analysis result for SHA-256 051e586c6fa605ce…

MALICIOUS

PDF

98.7 KB Created: 2021-07-18 14:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 089b7d50b45ff859d1f81fcb976405bb SHA-1: c4a1d918075ae7517be7365e52846bca882a23be SHA-256: 051e586c6fa605ce86cb6064029b5500598dedb42bb367289039aa73906fc4a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the structure suggests it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96fb6d186---nofoxekex.pdf In PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b4d9ed35---76111091722.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/pijalokewarobuf.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb13b12f7a---7147664778.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/53488353658.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/nomazaxefuwesefi.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/bipodegudesopurevudal.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/lixix.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608e336e8be23---bututolagugutex.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a47057e5278d988b975aba2f686a8ca1/raniwup.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/nakelapelorujalikisu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160721a949531b---kopubexojadufunogumozo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5a9b8ba6---14828860427.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/27f8089fa7829f4edc163687f7dfe189/natodebalax.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7d994e7a6bdb4a89fa7ebba13fadfc24/xikujonovumuxir.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xoretemawufetazoba.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/aaccb29826fa65043b4ef86155557fc3/xugevugusefuto.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5846a21464---lorolebok.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a99a0d2e8---10143719491.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160946312be240---66513249085.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/02vttokhr89hosltgt8h07s1o1/bopimixixipaj.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021070514561773499.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/95ea21820bcf099b75a1e4fea552b7ce/jezojofalejisogusigebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=opposite+of+expansionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 18156 bytes
SHA-256: d37348cd2ec67b96be3d0c285f14c4395fe5ef76f9003c6627f1522180d681f8
font_01_sfnt_off00013827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13827 10332 bytes
SHA-256: b0f7fcfc95d0298e5b601c4cfa9dec6e7775583bda91ab5e14c2e541a32880f3
font_02_sfnt_off00014fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA6 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00016586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1