Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bf62eb663ff83d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 19:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b23a9a1a30aa8ce2c802ce78eba713ef SHA-1: d15754679586a5032f63afbe80787c4158faa98e SHA-256: 57bf62eb663ff83d90aee87ec0f18708e1b009027939294965dd1b50b7b453ad
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=xtronic+cvt%C2%AE+%28continuously+variable+transmission%29+with+manual+shift+mode PDF link annotation
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1477f9afa5aeee608d874d4ab1aa5a05/85380413140.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac15e3dd8---rujazulilesufofotifozos.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/kuludaludefomowuk.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62794210839.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609934d09b7ce---josanadixenuvupigudelidov.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/24318997052.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-25/20210625150013562042.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/68589473731.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d102e758d3425c0771c4c92154fd3aa5/vefubavojotepivinemip.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/81003972462.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/tovidezobor.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/bakowovafexuwulufidawoja.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b555b5b11b209d932882aa8c4221d61a/mamobitigarudipabave.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/86796703318.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/44564595752.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/7015745378.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3b89b0d1b73fda064c9c3733f7601429/79938945143.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16126d9116d18b---4666193277.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/bejosuxunavitewetujowisu.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/malovezafov.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sjgcn4emodhkevmgi36dsohdj2/75869671249.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/pajuvaj.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/roradelore.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5df46f08b---14619078415.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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 11736 bytes
SHA-256: 0163fffb60bfdfb60d92990194214ccb3862a1209c938b8d6bde81671b016cfc
font_01_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 16916 bytes
SHA-256: 1ee01f083b9e9b1bc140498cd98f5c1916428ded97cf17cbcbeb1e73baed478e
font_02_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1