Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d862f0e4d1a31b4…

MALICIOUS

PDF

75.5 KB Created: 2021-07-03 07:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 400f2eba9370f1afd6001e0fbf62025d SHA-1: 374503a78380d05840cbc283fda049b7d07634f4 SHA-256: 1d862f0e4d1a31b46b9b9ed8e477b0cc1f40bafa1dd46621c8c01fca5d930214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=automate+am6+installation+manual PDF link annotation
    • http://studiodebiaggi.eu/userfiles/files/89154313665.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607272383e0fe---nifutonivom.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xapunulelejakagorelujuga.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/18d2ed47d4aeaa348920dcc4bcb87e85/73391705373.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/54949084787.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/loxegorujalewu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed610b0745---78720593941.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e3997ba48a7c14dfefdce39fb9ae0d20/rumoserolafoxiximigose.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/dcaf3594ef01331b1944da28bb88c43f/xalivexitax.pdfIn PDF document text
    • http://kingnature.ru/files/files/wofupipaputurokiwufijug.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b40f213dc2449b9f4357e023807b43d6/kinuwot.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c9d91069e4ca83ce4b6414bec8ba2ce5/79435218177.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fawik.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/duzebedupudob.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2571ce0c---borosuz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/85cafe3802189eefb99fa416433f5477/58932480582.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/36417181467.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717be3cef47---6501691245.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/o5j1goidshk4ov5q026gsk00o0/40401763720.pdfIn PDF document text
    • http://butterfly-propertymanagement.com/userfiles/file/39860867946.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77bcc112d---48783887746.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2537c59e7c---lejakipox.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ad23be2851eeadb148a5ecd295923957/4577468255.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/76927313733.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1a894d627f347f42b1181df8925fb906/sojosofetopod.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_off0000c661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC661 10420 bytes
SHA-256: 0eb301b1dbacc8f36c9edf4b4fc62413f34cf3809d16b5677a79eeac45db4862
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 16404 bytes
SHA-256: 3a148f0291b046beec42cc6d16d940afe27df59e9967ba0b9882b962520c3f2a

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