Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c7d2da1c30646a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-09 02:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 888f936b1044365e9308a94d55cf8d86 SHA-1: 082c9f4f671d233e82e8ca144b554ac4816f19aa SHA-256: a2c7d2da1c30646a98118b3b982938abb89a773f822ebb05e300a0926d1b1469
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://mamotato.ro/userfiles/file/juxowenaxazaxidikupeke.pdf In PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/wovaf.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/xixoravugijidutajotasa.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/21003464376.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ad1a63db271c23471719f0f305ef008d/84248545684.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/25077635255.pdfIn PDF document text
    • https://robertbah.si/files/file/78505806235.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/furodig.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/7217849775.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/75592533591.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/28262307259.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/zofozudiwimavowagosamuguf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6954aefe---57807482974.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/58153187874.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/nusavero.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/85003319824.pdfIn PDF document text
    • http://kyea.org/imageuploads/87048360318.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/83152725033.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/nadokazewatoz.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/kafamuramisetid.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/79672016114.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/wagixino.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/33cf2ece8ea7ca9725cf0a3b9262e008/xifugitikabogawuda.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/91270176029.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/kegobirodexetesumitexaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+black+2+and+white+2+romPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 10904 bytes
SHA-256: 593229b0df67a5fe7c36867b1b2b96bf2930e1de76a4f521226a7220648f7363
font_03_sfnt_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 24028 bytes
SHA-256: 95de85d04ca9602effbd2cdab77b2b9d665c57ca16e4ba0642838db38d4f83a2

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