Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec120f45ff1a5a4c…

MALICIOUS

PDF

90.9 KB Created: 2021-07-13 14:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 644c4be2f8e0a62c338660f4111f7a83 SHA-1: 0d788eaef636aba28354cc4e51acf999e2f7db26 SHA-256: ec120f45ff1a5a4c86099d5ad62eb201f8360c5c8cf54d28c455f9cd6488bb65
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/82a32749284c28ac25e70774d4dfa47a/kojatarolikevo.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2623de1c---mosivururivosafikaxi.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/23191777508.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/lozonawakimod.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608f593ca6ac6---waxegipato.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/50053312517.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/68765124773.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2c75d55c0ae3a434d42e4c5f2258935e/96713387515.pdfIn PDF document text
    • https://luminex.pl/upload/file/84994914022.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e45cc500cb4ff9597035583fc529f968/14813361837.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd908bb0f---55047901372.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1e6872db9320616969c1413642bc33c4/powonopulezawat.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9a8d4e98---pivesumekewotinava.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3gue8535sto50ealpp3dnupliu/nujatiwagufexagur.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9322f2e1fd0e4da3277ef14ea649a6e3/zopatibi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba14cc977bd---raxifurodo.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/seled.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/15256664335.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/66422477080.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/92817412154.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pdfn82tp983auutrt7lnj31504/22636174645.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f5a93b0c3---4331732429.pdfIn PDF document text
    • http://www.asslar.de/downloads/78927643065.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ad3467da9cc418f3924019e271eed045/32535807865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+take+pictures+of+stars+with+iphonePDF 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_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 17300 bytes
SHA-256: 2852425eda3ebd95edde906271cd34e9bb133da00bcb6e4cc9c094f0ecb89658
font_01_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 10800 bytes
SHA-256: 6465b583c58bc74e393a3dfc09ba7c9630979bda7702ff158759f4181d62f228
font_02_sfnt_off00014619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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