Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4c5f3fdb0bf766…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 13:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a4e41ee298d66c61bcd02b78e8eafef SHA-1: 0d65734324077ab690e53f3c560433d3dee51228 SHA-256: ac4c5f3fdb0bf76693fdc8ae6d3af59caa423f4c431220ca43ee66139f81c34e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://career-id.org/ckfinder/userfiles/files/fujunonozurizewubax.pdf In PDF document text
    • http://reutlinger.pl/userfiles/file/60155803408.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/09ejd7d5d343kjep4fol11v153/90420370270.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cd559f775---lovivuxotezusi.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/redofudidapimujigikogotu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/pakukanipifaguba.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/jolivabowogapojerikire.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ulqe2g4mt82bu7n2v2kk0uc06t/zadubuxewetuv.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0095b857f---mufuluwo.pdfIn PDF document text
    • http://placc.info/up_image/lawodedadafulug.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vdpsl1j6s5f524j1sp0g1em27h/7107713653.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a07a5a418f---94297154344.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/79464829872.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/vamuduvedizulubiwag.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b1de5da0d38e87c1f4879d51c908f02b/retatekonofowi.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/19833999033.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04253a5a2e---19896151669.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3f76663035470f2dbf95040cdb329e66/88691917729.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2c5c06ee---6833496106.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/fupimutarevud.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/tusowazatun.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/damosegim.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/p5gafukh3qmb24k177vre23r5b/gufajidi.pdfIn PDF document text
    • https://immobilgold.com/file/varimeduderadajotijoji.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e95a65c57aa---nivebis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=amplitude+modulation+pdf+downloadPDF 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_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 10560 bytes
SHA-256: 94d6a669e79fe7efa2c7a171550d21056c61e83a72e613948f3f3aa8a055f244
font_01_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 21268 bytes
SHA-256: d1213e6c2625a8aa90d531f3cf5a1ca7adf58992e87f5d5a5dbf991db6b8dcd5
font_02_sfnt_off000142db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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