Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8b5c7df4fd2feb…

MALICIOUS

PDF

78.2 KB Created: 2021-07-16 17:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4140bf898d3198c19e265c713628e4db SHA-1: b0328e0833211168b8c9f3fcea0c0b784bf9abba SHA-256: 3f8b5c7df4fd2febb7337bbf3e0d9b2e0c1ccad7661433248661fe4d66705c26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5fe2bf6d9ad4c81bbdd49dc86bb8cd0e/givizujokofexez.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6se2qrulkku8mcl2e4pr1j6983/60787424115.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/fisiluma.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/xugitiwagunevujaw.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/roujlsudfatmdc969q4s4mo6e3/99140130401.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/boxizew.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c3f429e45366c4a6fae13a6dcd89e4a6/pukawipofonuluposavuti.pdfIn PDF document text
    • https://naoshima-habitant.com/wevuzopifo.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/97962812765.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0139949850ee8f056169a004d037dc48/15382575276.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7911d8aa98---55137253435.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/obfh4sb1274rh3gtf56ada5kja/65171405271.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16070be6e53162---46814916843.pdfIn PDF document text
    • https://anfauglir.com/images/file/butunimogavexazezorawuva.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/15661162038.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f4b1ce6209e844ee8ccfa68dbdbf8f91/tubuvilamurunagogaga.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/sumadopumemawutunogoweg.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/44614306937.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a179d1edc---javepagevegalano.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/46907293672.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/53434551884.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/78f116997eb2f5a3c935161c471772e4/40682602725.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/cp9tm48ru86c5ib3u07af1kp22/10731248255.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/41236cbf0ad2b165fbb8d1f0ca54f763/55431088087.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/7600056762.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/xovopujudu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e49e6b0a4f9289e72b1d7d695ce510be/sekubatosupo.pdfIn PDF document text
    • http://alvitraders.com/files/91252365614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hdpe+price+per+kg+todayPDF 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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 10568 bytes
SHA-256: 756d3fb82ba4e2ed77cf99a0b4e4a65e9b7321e34b430da78b66c1f20be45b47
font_01_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 17164 bytes
SHA-256: af528fcddca72f09d8e892ac26306de7807d749f747768a15b08e24828dc46ce
font_02_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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