Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f7f7d2f0bd87a4…

MALICIOUS

PDF

94.0 KB Created: 2021-08-08 05:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 008ae349c3b4816b1e759e8301933e58 SHA-1: 918f03b3474e5dd4e9dc999539a70c3ad82b6be4 SHA-256: 91f7f7d2f0bd87a4725f703793099c64f7dbbbfd8ce2506be0c938aafc0821a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ace075985e05331e72a6dc5223c2619c/jezezarevoke.pdf In PDF document text
    • https://songhong.info/userfiles/file/kejafelo.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/47161269383.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4c8353ee---15743526292.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/98320428555.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/68058941432.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/21060659096.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd4f837dd---loxivokevogoxapetevo.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/76908429053.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jenidonebebekipifiraxa.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/telexigedosidobadebizil.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/vigun.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/36553378900.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/27ldaj4msgbecmmsubkti375qo/lupigowagagenujuxefal.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9b5930c3be4bedcb68894d8f922590e2/romebawivazivamewil.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/46227396967.pdfIn PDF document text
    • http://jinohair.com/upload/files/80683609092.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/61a15a95a19bc3475b7b3045458e3271/31739265119.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/zozutibozevagogupejilu.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/15913090327.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb11c978977---jejegokizeloravuf.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/dekexik.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/98694350535.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/muwodajoxowilig.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/15a32141694c5a1e1eb3cedbf701e521/wadiwin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+tell+oxidation+reduction+reactionsPDF 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_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 10640 bytes
SHA-256: 36291c59da0777cc80755e5f97ef88ec702c58d7cd3cbeb42fa36f34300a8d41
font_01_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A90 17476 bytes
SHA-256: db13e524fa0b6439cf8ee9673fb5331be3b5c5e4cb598d1eb5b7461acbaafb64

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