Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d945138e854d1ec…

MALICIOUS

PDF

87.7 KB Created: 2021-07-14 06:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1cb365e7acac35115424062711947ac SHA-1: 86dbe776225004f47ee859d2d80009e56b4917d1 SHA-256: 7d945138e854d1ec462175c90847e8221a0b4a7ee32f6f76390ccb40bc6fab7d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites, some of which are associated with WordPress upload vulnerabilities. The presence of numerous links, including one pointing to a compromised CMS upload, strongly suggests an intent to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://chi-kara.net/userfiles/file/86711193096.pdf In PDF document text
    • http://ubest.ru/images/file/75535203086.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/pujuxadufisal.pdfIn PDF document text
    • http://halaljones.com/uploads/files/gemukoroteva.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e82a785acd1c0680bd4602b4cdf94b74/sinuxogoba.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/v8ilutevqp19aprenb8h7faim1/74577356791.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1754a3f0---57186849810.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/52498682462.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/98590429232.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/505bb90e2db017ad01fb70be5ab7b603/54548860267.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e9e1b210---82805957740.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210608_f9fc6.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/jilasugawapoxowor.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/2702662237.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/beaab1a4b75ee6a64fea4d14c9f3a53b/27597492697.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/wizibafitodiruzaw.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/97882779149.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210626_56EA2F00AB26049E.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9698861da7---dujozupim.pdfIn PDF document text
    • http://ux-school.ru/files/files/davuxosopagidipanoli.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/temunowib.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9eluj7lg6upon44914hd928fp4/41003425986.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ubssjommj82o41i5ih7bo91ti2/65893747454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=age+of+empires+3+full+torrentPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10792 bytes
SHA-256: 76b85e0eb912003975faa75580c862e5ddfe6b370501bca79663bf90157f8aff
font_02_sfnt_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 21744 bytes
SHA-256: 28781b7ad4e32c1e9f57235bc9ace775d59e17bfe270526590587ce3260cf726

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