Malicious PDF — malware analysis report

Static analysis result for SHA-256 7154221cc280502e…

MALICIOUS

PDF

75.3 KB Created: 2021-05-30 06:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7d2c360bf3f401ef934b1abfba212d1 SHA-1: a70acf46043b6011999921bf475463c425115ad6 SHA-256: 7154221cc280502e1b121f986f165a5bc2f39f3cf982e7496d2eb2d55be8d15e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847ae9b065a---39857888681.pdf
    • http://stroisvias.ru/userfiles/file/91888174682.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b436f14a20---93709455837.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/co072lkac5uuf28u9snaoav4el/latefuxulokoje.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755171a89fd---55184912955.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9be2f9885c2f6e5260efff07a0274ab3/92054259431.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/28eee67d64140cb47dcea7db8e514fec/lizozenafivedudusiros.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/b17e4bbe92fa135db11034df14e4a6b1/16136912491.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a81bad06469dd369b8aa91558d525403/87577204291.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/72vg2c4qdocdk7rrpqg403o4tc/60218243143.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/23ae7059e99d81effb74dda27d699cc8/penujedalusixexesozuzo.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160777b6936b32---todalezipividazelegawuva.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770b5753f46---24639234918.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d969a3fd10---39850108691.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc4a35fb5---xexizuxumitisatika.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=identifying+unfamiliar+words+worksheets
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc48.bin
2317ca157feea89a0225e0ad4bbbe1546ec50b517d4e1c4d76702508f288b2b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 5396 bytes
font_01_sfnt_off0000ee87.bin
344a66b78ff522683baa3e5524b22a0e2313e51867d01454a6b59bfd57776f9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10304 bytes
font_02_sfnt_off000111cb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 4324 bytes