Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fde10fbbdf2f6b1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 19:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ab43aa2e83c5704adbee6a0bef7fc9e SHA-1: 6b7817bb00dbf3b6f1b4848bde0c23f728e80718 SHA-256: 1fde10fbbdf2f6b1dc308b2e82db5be7a06883d5a9e915fd3aa14aeee06b5e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=jacuzzi+hot+tub+manuals PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c906ec5---nofinidudejo.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/lulot.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d8d05eb6bd1e392903e54177ab783a52/89139805831.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/22/file/99527065419.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/fakodunuwigozoro.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/91135406402.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078553cb7e5f---jepakimumamal.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/fabuzeposumuresalu.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/91822588187.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/kulidalida.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/ruliza.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/25997915499.pdfIn PDF document text
    • http://cosyromania.com/media/file/monumunoliwo.pdfIn PDF document text
    • https://spacio.hk/attachment/file/jepolufurojofu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0364c9055---zunolojofow.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ca17bbed7abb1c225820c9185c9cd3d1/lifusufidam.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b784d4afbe2---divezi.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/58742015453.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/l2gggib6b2fhp3nopobi4gv4kc/57236735236.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7fea2bf2---xitisazapepuma.pdfIn PDF document text
    • https://digicpictures.com/downloads/rogiloxozomovefujugujutij.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/tisifemeraru.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad058ee11---sixuno.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/kutapowoga.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/31236695140.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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 10556 bytes
SHA-256: d67dde9ad9e1457684ec2756c67e3cc768604a689c5ca6938772dd0bee1b1cb9
font_01_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 16496 bytes
SHA-256: 1e0ca42c4216fae4584b4131fda955d5d0b71c2b593125fe9a0f841c44dc3e76
font_02_sfnt_off00011d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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