Malicious PDF — malware analysis report

Static analysis result for SHA-256 b989d5b188412851…

MALICIOUS

PDF

92.0 KB Created: 2021-07-07 12:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 28ed55bf836db24ffac0a6e27cc0d177 SHA-1: a8c7b3b4fd7edcbd00bc645d12b118c0930294de SHA-256: b989d5b1884128513266fada256103b1c959b91dff5e9bc0f3219b4e334bf43c
176 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 websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kppzp.pl/userfiles/file/sewedi.pdf In PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/16592473644.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/narawop.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f7cbe6eb---19055023548.pdfPDF link annotation
    • http://zeminyerkaplama.com/upload/ckfinder/files/36353570733.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098761a56bb1---puwenuguniwep.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/turokakijovosegosakurara.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca81669c24---33509805397.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wudinodemeko.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e1410116---30536864899.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/91848970015.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/jizubowigobanapajiveka.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/sl4kv7rdptahvqutlvf59ri3b0/48898450528.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202171205023.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/zawiju.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/90227978661.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f03e567c---jibakipotalopetowuv.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jatajuwemerojakepopil.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a174f195d5b9404ce08bfd03e8e58204/voxumosifijav.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4b9960c59b4c9945605bd6cfee6c5738/doratigijaberunotesen.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/16612516407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bacon+egg+cheese+muffinPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 10692 bytes
SHA-256: e4180e995c2748206fc31630372d9cadedc3432d2e327e9f88622197e200a64c
font_01_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001327e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 18584 bytes
SHA-256: 75f8b6c3b8cc1b4e5b3b468911066db0bf2aed89fda2fd3598372859ff294997