Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6139cf1c2aabc9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 21:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ff84f6d92f0ae96259642d135e7a0f9 SHA-1: 869fa209c9440a438a7e27d312d1a15a36e6e6dc SHA-256: af6139cf1c2aabc9d15d72d1b10803a5cf6e915934dce61ef4ab1b23c8ed64da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lapalettedesarts.fr/gestion/file/pugud.pdf In PDF document text
    • https://promise-land.com/upload/file/xetob.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160720228077f0---62461386757.pdfPDF link annotation
    • http://vishalaholidays.com/ckfinder/userfiles/files/pogesaduniliminulukaxad.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jokevixeno.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/bukegiregulorajupuwexabu.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/63894620964.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/farigoda.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/20725419834.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1f295196149cefb214c8a84da41385a1/sijogunakujov.pdfIn PDF document text
    • https://path.mn/userfiles/files/70463535150.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/daziwuravabem.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/jakutabidutoxop.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/lemewejoravotuz.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/fujukufobonagulovikevowed.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/rosulesibowufopa.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/53182704463.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/79305143763.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/mebewore.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n53sc7890ovjll5aote8r60132/46763462358.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c27b12029d---49618400179.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db5aadb81---52799074541.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/wanona.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160776a572e5fa---xoponemig.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/fiwonobuvipazoperiwak.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/gokojokojanazusonokid.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084bba9adc29---likasokufora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=guitarraviva+pdf+las+ma%C3%B1anitasPDF 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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 20724 bytes
SHA-256: c8a425b4f97f6e2ec47bc31ec1ab04b470182073eb9509bfc0f672059b8a839f
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10816 bytes
SHA-256: d6ce9443329e3e12032cd5ea770ba0806ad23ae9f04a67a23a937874a0151496
font_02_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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