Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac99d4e9f1117fd…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 14:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13d7cbd6efb060781dc74f0204635699 SHA-1: b2784f72eb30db120dd349545c9d8acfb6678e1f SHA-256: 4ac99d4e9f1117fd630d64abdba94700bb934c6e807a0c5ce90b93c94c346c08
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations, likely intended to lure users into clicking malicious links. The document body was unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

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 http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16117ca314f681---66139505560.pdf In PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/vagixafup.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kunedaropifibapus.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099e24e1bced---binarotimin.pdfIn PDF document text
    • https://fasaac.org/temp//files/wusoduvufexoditerugirasap.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2589bef7632eaaf5d6c72ae634a5a1c4/wajurilowewofedamanenuwu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81859d467---96994941338.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9d703cfb8caac9ed5f03507365f2abcb/buzanipuwa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0bb0819cfa1e1321a7ee1ed41e46478/vokepikiroredaxitaxe.pdfIn PDF document text
    • https://bliznacite.com/files/gupinupowugikudolupuzilo.pdfIn PDF document text
    • http://blueyee.com/upload/file/201425059520.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/vazawisugagabadedug.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/86av507t1kufosjqc113de83lu/99808555893.pdfIn PDF document text
    • http://biosite.ru/images/news/file/12593229773.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160900d6ae51ea---686403368.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210719001324_dm49gv.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/seriwikuwalanikagunubete.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e003570f0e---pikirofilatamasow.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/didokevapiwowoveza.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b432225f645---45584071186.pdfIn PDF document text
    • http://adveotec.com/img/file/50757564803.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/jevevaterorarafekiwenu.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/gobidazutat.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/bulisolidetiboled.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/8733396943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=applied+econometrics+with+stata+pdfPDF 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_off0000c20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20F 17336 bytes
SHA-256: 466c0aa3011d0b530f4d14e458a7124875fb826c0fccb7963ee22b8798bd8930
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 10952 bytes
SHA-256: 71fc37c17aee3e226b654887815addead282229a19e0fb6d7b93a1cdb7844142

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