Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83d9dab80c40947…

MALICIOUS

PDF

91.2 KB Created: 2021-07-03 18:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44a3542fc167f1ba1b00ece0bf4f73b8 SHA-1: c9752d5cbe60a88a215f64359169da8ca04c13ad SHA-256: f83d9dab80c4094769d84b5123539dca855e903cb55c3da9bed497865e3ec885
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to direct users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160730cf2d8b88---rorutulitoriluvu.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/2b4e847a59faeb1cffb658fa535db8b4/tonelirezagefabuwipi.pdfIn PDF document text
    • http://rentaruedas.com/files/others/rotefafe.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c469df0d94b---xutazamijifuzuzovox.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6hrld82a7kpuku3j2lutsff8qi/25090865958.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8dc12c4b4---13687857428.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607499379eda1---79638153404.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd30acc6a8---48312307301.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/23704713308.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210620_013608.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/44676579857.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/gikijawodawiwesegeku.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083bebb324b9---48337830321.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/mel43q6j1t3lnfv3k47h95nah2/zakusajara.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/puxudoxebenuxaxewimoburoz.pdfIn PDF document text
    • https://flomogroup.com/upload/files/58573738161.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/90294362319.pdfIn PDF document text
    • http://atek-ent.com/upload/file/25513455213.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/46455456170.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/dezunoduwojefipugotariz.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9999e88a59---8691296319.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/od6dvv5di754er1o1mq8d8bjnv/77384707195.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/75418410784.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29878524ac---dojimetogafazoju.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d936e4e896f---29373667057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=punctuation+for+to+whom+it+may+concernPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 10688 bytes
SHA-256: 93f3c449e52dc69a0e49e10e7d08be70eb2eafa30e1617db0f85fb48778b1ce5
font_01_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 16808 bytes
SHA-256: a9a2a4372cc9e271492eaf7cd43d5dd4a8dff2fe737c22651a6a57a4a676f92b
font_02_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14403 17016 bytes
SHA-256: 34fdaf012e8c2a97d1b95598d1ab8f385846eb43cff9991dda3173e1634052fa