Malicious PDF — malware analysis report

Static analysis result for SHA-256 433f5a1f1837f3bc…

MALICIOUS

PDF

84.0 KB Created: 2021-07-20 08:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3b9bc57af5e552c7463349731222ef0 SHA-1: 55f01240efddad5ed6220e17b7d60692f42817f5 SHA-256: 433f5a1f1837f3bcdaf1c4db195088d396d5aec9988a8df47a4965c460176832
184 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm pointing to compromised CMS upload storage, likely to host malicious files. The presence of a 'download button' lure and a callback phishing pretext suggests the document aims to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb604c6102---zogopanuduboju.pdf In PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/9243613579.pdfIn PDF document text
    • https://besteva.com/upload/files/29515472644.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0c90bff8586719bb1dc02cfacf5a06a2/bimede.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/12144593529.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gazosijolikuliwokob.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76df4a0fee---37450543455.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8a5f8bf153b5f730b2a38b57ab53a68f/ximemezi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89fbf4c1aa---8377270834.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c8622a8---jisapapifed.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/11515413553.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/xawijevibizisowifomokek.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/35049f60a23dd699d8b7803d9fe2a7e7/73246485790.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/tudiwotu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badb08ec5c9---fotezozovolotek.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8136621457adec55bd5ac0eac6963462/lowifebedulupibijife.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/78630348594.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da432085e57---daxodetebebum.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b401c9b4---34216564457.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/emr78h32rps0orisvdvjsfm157/lanutafa.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6359c56a631220354c13ecbe797d92a3/84884748802.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/9b2c4o3gorupgv8il8ai8571q2/30048134563.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sasugadesux.pdfIn PDF document text
    • https://avela.md/userfiles/file/29107997484.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/sefevivizewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=examples+of+first+class+levers+in+sportPDF 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_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 16840 bytes
SHA-256: 741ba408c233308017475245c2753ba87fe7604a2d838a9f59607b7b27c1cefa
font_01_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A0 10792 bytes
SHA-256: 72375e9d3f05a8ef13ba23453a043197742e268381610aac19e1c36dd06cbbc4

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