Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55162d5826943d6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 19:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca8bd39e2fb94f046341281ca0d49579 SHA-1: aa2f1891d575233eb1a0e624108dbba482f41f08 SHA-256: b55162d5826943d6cb5b337e4b9e9814dec9b45ecd0baf3ffb81391c7959a47e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as compromised or disposable hosting. Heuristics indicate this PDF is a link farm designed to direct users to external, potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=how+to+screenshot+on+phone+without+power+button PDF link annotation
    • http://haiqi-machine.com/d/files/lawen.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109091032018369.pdfIn PDF document text
    • https://digireg.com/upload/milulazebi.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/lozigaboxasox.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/tubakanoziralufogivem.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/66526525593.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/joluzor.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/58240911119.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/nopijuvemugujobenosomeras.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8450c552517268264d319e2ca8e41532/11439308392.pdfIn PDF document text
    • http://llux.vn/uploads/files/81764879966.pdfIn PDF document text
    • http://soles2walk.com/data/file/weganurovetopujekokuju.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/65542274721.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc52c5566---47830686701.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/kukomizuda.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/momorikagoneme.pdfIn PDF document text
    • http://sayarbobinaj.com/file/44185214465.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4jde2tpapd9np2k0kbjhmn425e/11857218788.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/zanit.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130efb5c1fd0---vapesenuzaroviwixareko.pdfIn PDF document text
    • http://e-district.org/userfiles/file/vagositajejunufolawobine.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/simifenanogozipirelun.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/11696156918.pdfIn PDF document text
    • 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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 10580 bytes
SHA-256: a1055249718184ccfe9c9f5d975c18f9fe6b194b9a6133755fd44c7faff82dc6
font_01_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 18656 bytes
SHA-256: d2e8f9e2a951807d368e09c8d82fc141fb5050b0de3c1320daef8c3e6cae43d7
font_02_sfnt_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1