Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbf91e47fe650ab…

MALICIOUS

PDF

79.0 KB Created: 2021-06-26 02:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d20ae45bdb94b6bad69e4f95eee64078 SHA-1: 2c5563b08b4ee52919b4293f314550a6e6bc97ff SHA-256: ffbf91e47fe650ab2597fe0d872cecf7a84cac8db7d4f4a4e97b918fe0bc36fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=convert+word+to+pdf+online+for+free PDF link annotation
    • http://afghansolar.com/userfiles/file/79332207713.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/kuzazajogaz.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845c74e0049---jenovameteg.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/83912364032.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/77562955289.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9646dc91---wetiziliwijuda.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c983f6997d1---83122705094.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/fcdf724191a7f621ffda420533a34a6e/20980752001.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/61ba39f59e0eb4039ec2c75f151c476b/wenaniwedazizunedajenis.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be7f5dfdc7ccb3e515b455e0c9c609ad/desavib.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ht7jjnvcmmjflnjthdfoupb9sd/xefoxodibot.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/57293009629.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vapitituvogaxame.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2afdd5df---meferasuxedil.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa27e1246---jakilewexotu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ba1e7c811f332a6bfbc9d64e81e593f/52385431997.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/89805349241.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/pekaxak.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ohsn65bgf4fq3trg2ggdcql0fj/82009310080.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/51368847033.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/q162snudr3qdfe4qes0ghqqvp7/momifawivixuwetuxujazibof.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/minekemilofowijedorur.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/zemepil.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/mokozazurexupilivom.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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16848 bytes
SHA-256: 4b15fdcd502fe3ce5c91be58a97a752f60cc624e1cf8c39f4c031997bce70de1
font_02_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 10344 bytes
SHA-256: cdb345d1d231f0eb1b55e262f5abe4f4f24604150d215453fbd199345b6d3b5c