Malicious PDF — malware analysis report

Static analysis result for SHA-256 806ab9031a7e31e9…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 19:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79d1631b6526b0a526df32a3ba79f309 SHA-1: 87a61eaae7d4ea5e83e1856e42316dd45a1b2f59 SHA-256: 806ab9031a7e31e935f41bfd88f22f6303e4fb096ac4a97de06158e61d40dbb8
156 Risk Score

Malware Insights

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

The PDF file 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 distributing further malware. The presence of multiple link farms and compromised upload directories suggests a tactic to obscure the true malicious destination or to leverage SEO for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=nonviolent+communication+a+language+of+life+pdf+free PDF link annotation
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4535affaa45bf3b3cff723ac10a73d2e/99465963481.pdfIn PDF document text
    • https://ka-base.no/images_content/file/95035691627.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/wasax.pdfIn PDF document text
    • http://sgpeo.pl/users//file/futulafuxojazalufuta.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/81549444727.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/45612583035.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/88549700737.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f8d5fb185c114ca2b37ad99544007ad/divozajumasa.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/22298636336.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/83062903681.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/giwodopekuvuxogo.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc57dbde72---desukobalamiku.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/suvabifuwotefotanasidupup.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bbee7ceca1ff2e09f744a490c39bd039/jezuwufo.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a246f3de---86309167084.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gccgvjfkphccr672q7pvrfofvq/41206994631.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/76863654530.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/guruzidemad.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/87156040383.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/0guu2v8sgs75246i9c2jq91f3f/farelubilajeminegifi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116367c4ea3d---bevavopalesu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071bac139299---zinejatesugepodefito.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_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 17116 bytes
SHA-256: 02b9557e5771096e6e57b7a31ca014a0f78460f566822dab6859a5948a6eecbd
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 10936 bytes
SHA-256: f6e4b0c50fdaee262048a14db230f1484ec687df0610723ccad418d4ed547671
font_02_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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