Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b1f4913721e7ea…

MALICIOUS

PDF

73.7 KB Created: 2021-06-22 17:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9ad0d392e7f28b3b87f9e86133f87d2 SHA-1: d245cd6bbe1ad16d7f981d0e7251e3f135de900d SHA-256: 00b1f4913721e7ea1a4d2131f3b53117debd70d064b8d9813fb2521e87985c26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to multiple domains, many of which are hosted on compromised or disposable infrastructure, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://automsystem.com/UploadFile/file/20210511042929979.pdf
    • http://swaminarayangm.org/userfiles/file/33723088489.pdf
    • https://jordan.si/dokumenti/file/lolawulu.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/77561949045.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/92679a4bd1b6f4c8066ef11c458406bc/50920365109.pdf
    • https://matrainagycsalados.hu/userfiles/file/lemakefekupi.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/keximaxite.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1d475976---boweg.pdf
    • http://emeat.ru/var/files/dakasupubavifetovi.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083661f5b805---famegomurugixejikaradu.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8d0076447---38080965707.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/b9p6128l1ag4mu5q460lu0q5bf/40518767100.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6p93g4ih64v4cg037frmpfniqm/91410431034.pdf
    • https://ivanda-commerce.hr/userfiles/file/mazax.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbf375bfc---rejofugi.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/og012bokkj0eh13r0i4dkgesjg/30012488242.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=convert+pdf+from+japanese+to+english
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/13086e7bd1ba44abe3087bbdca6dac68/pixedewubagixibomok.pdf
    • 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_off0000c698.bin
b812fe750bbd0454bd640c1b4bb0d322abd4620618f04135e496fe3b23b9ade4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC698 7828 bytes
font_01_sfnt_off0000e0e2.bin
5ebe90b25f126e0e6178a2a871e5e7ababfa4f7e6f2cd80e050593bb1bf8da9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 5496 bytes
font_02_sfnt_off0000f370.bin
af1c8132f4fde312b8d5d83198d11bbd2ea1468256fcb01a0ad502afc325f139
pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 11172 bytes