Malicious PDF — malware analysis report

Static analysis result for SHA-256 42896c537d81f545…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 15:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2af17f150b61d1e37f8f55a86e6fc9f SHA-1: 3b460a80676b7266112df53de984246141c452ae SHA-256: 42896c537d81f5457848bcc9adc20d4fe4c5222464dd8185f2d4952305cb26f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=cast+phone+screen+to+laptop+via+usb PDF link annotation
    • https://guineaservicesproviders.com/gsp/files/dalegowazosorejugisoxava.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/5758169879.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/durolukumaziputowokufuja.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/giripupow.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/xanisexiwoxepojedabozimo.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/46212623560.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/xupakiberafigidel.pdfIn PDF document text
    • http://emeat.ru/var/files/46038189009.pdfIn PDF document text
    • https://cooperspick.com/files/lizujelamuli.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/raxaxifi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9375bbf7d85e16d83a38f318ee8b7b25/dirugosixuxami.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/xufuxixube.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/jajizuxavumegefafanifejan.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/jopiwikot.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/bonurarope.pdfIn PDF document text
    • http://www.moyekolodin.com/files/bolinezotigunuxom.pdfIn PDF document text
    • http://chpcentre.com/files/file/70590144260.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/bigatu.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109091731376460.pdfIn PDF document text
    • https://ms02bet.com/contents/files/34629164889.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1523e5eb4---mapogituzowato.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/39463680642.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/64249643055.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/972b444247f43f36ba0e86ac7e923ac8/kuxevowebekujanamarumi.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/turuz.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_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 17804 bytes
SHA-256: 1e1595ad50dada99ce09b7ebd3356166f322e81d7a59b5bd1898f23e96460323
font_01_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 10808 bytes
SHA-256: fbaa2dc840d35ae5ba09730d0f593ad46e15e035f8d7ee1c92dbe9fd73393fa3
font_02_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.