Malicious PDF — malware analysis report

Static analysis result for SHA-256 662df9b3d6f3e5f9…

MALICIOUS

PDF

92.9 KB Created: 2021-08-09 10:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e7abab6d5eae0e50390053213f4573a6 SHA-1: 1e0b46c0fc35e438330fdaff0b243f9e1a0f3401 SHA-256: 662df9b3d6f3e5f9b06e2bd427119d65e16ed4058b751e6d3771c23c56ce53ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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 https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607488123b0d7---304187769.pdf In PDF document text
    • http://cuatro-pr.org/sites/default/files/file/6873018558.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9c0064ce1a5394c47bc369aee984dba4/mapaloponazu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607411f48023e---89640329833.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f98722c8---36805977831.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/37e5e41f26bf426fe2ef9147d60916d2/19332942224.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/94356789162.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0c2eeb91fee501109611c80adf36b96e/nubupupefuriz.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/933053c6bc8e92260e1a038429e122d2/20927387464.pdfIn PDF document text
    • https://vitanov.rs//files/bikeku.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/00b13dff1daba19bc628b7e3902862d6/33221214785.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/15560340640.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b78bc52cb40---30678275128.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/wunexemi.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kexadusidum.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccd455800---sukagukarifupaputusufevi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/8pbiu6rfqbsbbs22okcgihff75/lupamaxovedozotav.pdfIn PDF document text
    • https://tavio.ru/files/file/19020902464.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7s39glc92hqgq3tr4oj3gtu7ef/13440794595.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081770759c82---86344615321.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/bawolowurokoxeluwo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/1382cb3b6a5fa9372398d7ffc3758e87/wuvafapimoludowidomasu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3cd5c98007---9461215367.pdfIn PDF document text
    • https://egf.tw/test2/images/file/banulivasosuti.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/31404680370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tamilrockers+full+movie+download+in+tamil+2019PDF 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_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 17180 bytes
SHA-256: c1522ed11f18b92671d559125c2ec5d21ca87e323ab56b5e9e3ddbef6b94806d
font_01_sfnt_off00013189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 11408 bytes
SHA-256: 7b91d56577d3c5bf2dd08b90530cf472f547ecaf487f85a402d239c2a2814ba3
font_02_sfnt_off00014c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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