Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e044e4cf37fc4a0…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 04:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f300d1239b3ccb37bc90454f3fc94bd2 SHA-1: 34230d3c95c03987e74ddc6d5431f64d07a8b59d SHA-256: 7e044e4cf37fc4a032ac77900684e5124517a9352af9113dcf6d9056d6a369d5
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://conomiya.com/images/uploadedimages/file/60254864528.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/2trrujghprtujti9nnn4nsf3t3/10398646417.pdf
    • http://diamond6ranch.com/userfiles/file/lobuxujexixobodawaxaj.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210617120545.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a6f04f7a---62175396272.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/24427722754.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2rai18oq9ijpdcvrm5cbtv55vv/juponavejunuzigetemubeges.pdf
    • http://candientushinko.com/images/file/vaviwavajuzukewajiti.pdf
    • https://lee-trading.tw/archive/upload/files/vusufenin.pdf
    • http://kstarsmall.net/userfiles/file///18860813840.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc2ec9c7b---18063176624.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078df3ab20d1---61990040604.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b93dc78e43---pixuvire.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bac4cd0b915---nuziku.pdf
    • http://espacioschillout.es/images/admin/file/buvagurobave.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a436411915d---33639297048.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0e64a83b05bf98ccc93e9fc3a17483e2/jojure.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6df838029318b930e94f6ae3c21bf2d9/78720484480.pdf
    • http://angarakshaksecurity.com/userfiles/file/22698896019.pdf
    • http://thepnguyentran.com/media/ftp/file/sisozipog.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e3374284---32567152603.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=if+we+can+turn+back+time+to+the+good+old+days+lyrics
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb97.bin
c1b6c2c30f78ed77dddd4ee02e8dd013e0930c863139f1ebb2df14c237e7337a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 17676 bytes
font_01_sfnt_off00011915.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 16792 bytes
font_02_sfnt_off0001312c.bin
86aa880faa8cfb2b9e29bc9d705bfa47ed6ce89069d22b7120ab811ddc4c085c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 11404 bytes