Malicious PDF — malware analysis report

Static analysis result for SHA-256 678152519eafff46…

MALICIOUS

PDF

95.5 KB Created: 2021-09-04 00:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7aa2afa85238b9744d6a6ee095fec3c8 SHA-1: 351cd7d393da7fa268c5584f6921c630ae969434 SHA-256: 678152519eafff4608079ae12329933286d674668d4b2ed02c36ce9c97146fcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/711d9ad35ebd4adacb109d69bac5868f/31757410166.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/degagafagerutamufugidap.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/519532571.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/vimebejopevunaje.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/33efb1f8439577aabdb2902522e34630/gakasonuzad.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fc336a8530a0c0a3e4eabebfcc999478/bowowajad.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b80412c8feac0c6f1e84b54fddff64b8/65248822623.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/benifojovewitosasam.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2op3pqojuhectqttnqkclitrut/53090964925.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/sozawedabi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084d592c9f7c---36398281056.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120a2f720f39---49501328792.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd9aeaa17---55074614638.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/voveka.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ad6qkvkt52u3ab5m4uonar8hh5/5657149112.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/80626402891.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/lojomiw.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1a0a3e266797397438d0d9c39ceb0c2e/52857522468.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a409f7b914---84413747464.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623658153.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/efc71c315b6f5ced46c1a7241ea7ac09/10486810426.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/08105b0a8a8acf2c08d71a7a2e5c5b6e/pugevexumi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803fc3b1e6e---87792927204.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/52402988260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=machine+learning+aurelien+geron+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_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 18980 bytes
SHA-256: 783b43696aa6443599cb1c287f0f1bc3d4c9cc600dce99d9c6a3ba906033f4b5
font_01_sfnt_off0001406c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406C 10724 bytes
SHA-256: 44ee098e67c207098545340f61b503f652c176f0a41a823644a02036e0913f27
font_02_sfnt_off000158bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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