Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ee43aaaf78afd9…

MALICIOUS

PDF

83.1 KB Created: 2021-08-23 13:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e289bc347b4c9dea6b5d8bd155724598 SHA-1: d576021656a1a68e9d8f8020d0f0df30ce839c6f SHA-256: 79ee43aaaf78afd975aba030dfd17e756600b62c3ba1ea2a27a17b278c627327
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters in URLs further supports the link farm and potential tracking/phishing activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=chris+gayle+right+hand+batting PDF link annotation
    • http://reicar.dk/userfiles/file/fewoduzogodawipuxot.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/59146727888.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/mu5loi12ha12otr0dql076cs8k/kuwef.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/27600913258.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/korowu.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/vukalititowadanubajasuza.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/xewojadesako.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb8b9dee880e1c3a7037a0d7ff7f5800/rideje.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/651e6bvlc6vrmai2g34c5kb6e6/dusij.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0d1423d7d785e408c18605fcd5f11b3b/86757808475.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990a0db0fa4---9525848766.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/31891235386.pdfIn PDF document text
    • https://assistenza-termica.it/file/34897582875.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/13431660380.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf55f4c9650---guriridudanubegalide.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/fosexaxabejerazafejizoj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878998a8b91---xuvizuwojabozelobigoviba.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6cf1330e49440934cf753bb58b9cd647/68914899414.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf84aa773d---33158285334.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ncjaadlt95vqg3qp2kajq0vfn3/40720736937.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/wamezukekojutafiku.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/xijetilaku.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/taooplts7td9l81lesm1djqsek/gatitiruf.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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10692 bytes
SHA-256: 13995e1940b7374393ff6a2d701cc39f0393060255494a9e0e86e1d9b8dda74b
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 16860 bytes
SHA-256: a127852f60fed06af04613b2aca3014af021de1f9df9754dc3ff941a48a2249e