Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a68bf09a18aa31b…

MALICIOUS

PDF

96.9 KB Created: 2021-08-14 16:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb50838d1869cb353adc259e118ec3cf SHA-1: 8977eb2a553cf7d58d9cddbaca98b40224a5dd5e SHA-256: 6a68bf09a18aa31b00a52141e63cbf8143eb900fca4bad0d85414a3c96f82db9
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the embedded links and the PDF structure indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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://krisoc.ru/uplcv?utm_term=codex+space+marines+digital+edition PDF link annotation
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828e8447895---tinevonulumizugitap.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dqtmg9i3vjvtq290s6seecmh32/kopizawas.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0h1othppvkill91s0r8s23caer/walunonebaxomeletobabek.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/tusenenubupawasubuveku.pdfIn PDF document text
    • http://qzgyhs.com/Upload/file/votoxevurevuxolewidazo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d605415a20f---vutumupasupunenepuxamisu.pdfPDF link annotation
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1135eaba937cb894c9a2e6483936c391/bagaxerorawuwom.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/32336475702.pdfIn PDF document text
    • http://sparkpro.lv/content/file/77697830674.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/71307062389.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fb6b2f4c453d2341122ff74d285962fd/tegokubofawabogubapo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82831f3c5e---zoxobobego.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/godinidosuxemu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7c4d1fdff9f008b2bcb5d87694349677/12460701325.pdfIn PDF document text
    • http://samtekelektrik.com/files/95196287674.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ejp9j41ffm7n4j3g5737vla5cu/wekuxuzaginikutipipiz.pdfIn PDF document text
    • http://bananamusic.tw/uploads//files/202108010911307086.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/tr3ir2chal7fq1i2b0af9v1pba/53433307073.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/91438661806.pdfIn PDF document text
    • http://ashioke.com/images/library/File/tofuwiwemabigimupi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071a55a1343c---76765872854.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f831ac219---xuvujutel.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/jivate.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5acde1350afdc5866bdf46e380454022/senidezimen.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/39d8f613343b2b70f2375dc2d4465c2c/87173600375.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608c130cd888c---17148818754.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/vunokinesotuwaloka.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_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 10992 bytes
SHA-256: 18bfea3523eb12b4b3e73c3322154b01ef42bfef926413e76cd8bc7eed2c5bb8
font_02_sfnt_off000147ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 17348 bytes
SHA-256: 1b851a25abea08bdebaf80817886d7dad805b87a926074ce1915598ac70808af