Malicious PDF — malware analysis report

Static analysis result for SHA-256 65de5bf875623821…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 10:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d27a1a3fbda5205a3648fa4e1f16822 SHA-1: bcf6faba11a836f71332f858733cef1f89213c82 SHA-256: 65de5bf875623821af7ca22d20a2e05ddb2482dd4afd689db120857397a84fe0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://garglob.ru/uplcv?utm_term=bipolar+1+disorder+dsm+5+pdf PDF link annotation
    • https://audreyheselmans.com/_files/file/39168576744.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/53053266281.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/18729897008.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef5f341553---vusogozivujan.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/90078389205.pdfIn PDF document text
    • https://parfumzone.ro/files/file/sanitozifakesej.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/kuxuni.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/14355199613.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863ebe98043---tinafituwixarebevonugaj.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35b036979---36819521095.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bsmmpllanvd818vn0ddpors2og/kotizazilukoxenikagovunur.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xemasagipebebatelo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/pevagi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/03b60e1e9ba94637bdbaebceb5dbf9a4/51857327105.pdfIn PDF document text
    • https://magatek.com/documents/file/zavuzuxotilosolakuz.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/95e6376d3d3ae334889c6d196dc04678/sobafajiribexisabu.pdfIn PDF document text
    • http://ellev.fr/upload/files/dorunezixenilivetiso.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/85ab0b2f3bb698f7c63331191f8d5153/peramizetuvu.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/70299626137.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/90386840744.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/27508631705.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/83fde6d524d3bd7d42106b99d1a584c7/53767395150.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/nutumaboxagevuriti.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_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 10696 bytes
SHA-256: 8f9500425bdec6a5b2e6a27ac4adc71155739ed77a37763c5d807932d3dc8754
font_02_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 17388 bytes
SHA-256: ca34144e70f01f68c9fe2e796a7a46c576107aae7223eb040f3747cee98e03d1

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