Malicious PDF — malware analysis report

Static analysis result for SHA-256 72734a2b5b896909…

MALICIOUS

PDF

71.6 KB Created: 2021-09-01 06:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 21176ab20b2c6b5043d7497dd957d7fa SHA-1: 199fef07de492946c8f1558430b12978245f3e6f SHA-256: 72734a2b5b8969090b6b3302806ffc4eeb5a3c80d69ec556b353a65c11358b95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting sites. These links likely lead to further malicious content or phishing pages, indicating a multi-stage attack. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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 https://nomylo.ru/uplcv?utm_term=android+1+dino+water+world PDF link annotation
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/05tb97ekbct4o46iuc0go5d9f0/73861193629.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f908d07606c7e192b62d7cadf1526ec3/98327512398.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/79826558003.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aadaa1f41e5---24320342625.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f2f72281---woxuxudevinukab.pdfIn PDF document text
    • http://serting.eu/userfiles/files/14178271489.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/guvaba.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d742ac78---berutoribuxiboduraj.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4727e8f4---rotisaronumoxokovafeme.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/lazifexadulug.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16099e74137894---pobalufu.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8p4cr6knqtk3f8nh94t8nno54q/68224602563.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/82455644707.pdfIn PDF document text
    • http://hbaoge.com/upload/files/7098169253.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c35e74d0076---suzikibusamesasi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ae5690f0---rivodojaziteki.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c94dc3ab6bc---27688547822.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df39a898fd6---wovimevugelepizokura.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108172124403762.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca56d1b0ed---rowelufuvujakowamer.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811de79703a---dapokafujizetarevob.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_off0000b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DF 10192 bytes
SHA-256: 6b80143e3cebe1d0f4c478592a6a2ba2e2dd132d7be6c3b732d2ed0cc3261232
font_01_sfnt_off0000cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 16548 bytes
SHA-256: c878fb0baf16fea62bd14c32bc1e7b57c4584e18145ccd959121ba7db7e00c7c
font_02_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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