Malicious PDF — malware analysis report

Static analysis result for SHA-256 933830d19b880eab…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 21:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba5d0a721db456d5f5693020f3898ee8 SHA-1: f0455d1bed9e8e933056dff567668fc92e1cd5fd SHA-256: 933830d19b880eab7c1ab384e2f10f6ca19a30f62981fa6965185aa0e4a11c27
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. The numerous embedded URLs, many pointing to compromised CMS uploads, suggest a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/68a57a2bd80acd3ae55cf93284e86148/29533919295.pdf In PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/10398820357.pdfIn PDF document text
    • http://imi.vc/upload/files/wotusadululo.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ec1de413c1d112be2899acf2c0f60d63/4563717820.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021082109033673499.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8e4e83b93626080b2cd97cfe7bab57b3/jetuloluta.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d89e58eb2dc0ab37785780005efd1c4/11017254073.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e352023fa---xoxubinejuxakegarep.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ff7fc3770f4e444a6e6cfe9eaea0b8ae/10981469017.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210710191404.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210728_766950B428290DA1.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/cf54d927c80648858f8dab7fe853ea35/79948345871.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/2p32de8inlamijjrmu8i8gh4uv/94557324504.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0c9308072d7762fd7e26a571a3afae09/fuzoxizebekimaka.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/86f758ae903d0741e07c4a734ca71e00/58513648249.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609aab3372759---64390143839.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/tesamowigafivolimuguxa.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/12966695710.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/72149463761.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/79ece9871719380ed48a403e19e630ad/65143375845.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/15519389760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bsnl+telephone+directory+chennai+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xajorisixovorasa.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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 19316 bytes
SHA-256: 2525dff7dc167f85045a1e39ad2919548ea56fca5dfe1f7820f0a144ba203c05
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10884 bytes
SHA-256: 6bac44b1153c861c3501c3f9f5d4c0fddbe25fc1e8434abe3612d71d181bc761
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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