Malicious PDF — malware analysis report

Static analysis result for SHA-256 182bfb309f8a0a4d…

MALICIOUS

PDF

109.2 KB Created: 2021-06-30 01:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0937a4f77e3a9182e0bad7d6828ee137 SHA-1: 8f03e135d03c61fb0846818706c596abad4f3237 SHA-256: 182bfb309f8a0a4d8363a7dbbc7cc373936ffa68871cf4522ddc89365faf9c9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection: Process Hollowing

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. The file's structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e2498c8ea2e70945f97b15591e50a21c/55809091688.pdf In PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/42f227d66c8d89142e3c458db0ac6008/14537308855.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/2e018a6c1c2aa13bb6ea7d685f3b29db/55063281255.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe566059bb---kebarujarita.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/adc7ae40eeb4ab1821e763e97e516a5e/sivizuzalokof.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/bamowi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/5702115880.pdfIn PDF document text
    • https://scriptdd.com/_file/file/rogila.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/98097058270.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3c749c441224dfe274bd4530c4739152/79446400734.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/90752292343.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/nuxexeno.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ea04b16ea467533022e67e4ffe2dfa22/41277454557.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/getuxapogikew.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4f425403---vudetifi.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/tadakifusowisixexov.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609771a9e6f0d---duwojepeguse.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0daf027dd8---nalikajesoxosud.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/56690342389.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/66253345417.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b634a6d2212---zinavijid.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/11089522760eaad476f6ef5ad4a68c5e/26294524716.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/jumiz.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210616_70265EFFC545B072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=in+the+latter+meaningPDF 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_off00012d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 19304 bytes
SHA-256: 2bd398f14ed15bc1717ba788f6add43899fc4afd026388b274c820d8250c63b3
font_01_sfnt_off00015f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1C 10216 bytes
SHA-256: 922c47a92a285156967974dc2bfcc7ab4992721a9278559fdecbdc58896c0f62
font_02_sfnt_off000175b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B9 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off00018d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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