Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af462c05bb3ce05…

MALICIOUS

PDF

88.4 KB Created: 2021-10-06 12:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3ab2d8b7837dcb241a7657929e5723a9 SHA-1: 22d6ff20b1c98504dfa55aab9287941d0d47c5f2 SHA-256: 6af462c05bb3ce05be27b7de49cc3f8b120afe60b16522458dc658a65ba9923f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with several heuristics indicating it functions as a link farm, potentially leading to phishing or malware. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yellowmangocafe.com/userfiles/file/karigixe.pdf In PDF document text
    • http://rpsbchamber.org/editorData/file/mefefadizavumamoferol.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/lobanizebufadefodotesunug.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/fufujuto.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/zanowefovizez.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/29159303641.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615adc4aec5d3---tibomuvevux.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/lojalutadipevonevemiser.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/sunonetigikugi.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raluzepizebitabo.pdfIn PDF document text
    • https://gdaniec.com/upload/files/31825081693.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210910_5D0383625CAEB598.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143154dc00ff---58181947298.pdfIn PDF document text
    • http://dhf-china.com/d/files/69939268627.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/95152486942.pdfIn PDF document text
    • http://intertribo.sk/files/vepux.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/jorunowikuxomew.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161368c73860c0---xedepemibaso.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/kuxunubatum.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/gesapimazo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/toa9tcsvpa1glp92qeos8r6aoa/godufarobokogosuzu.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/23762567170.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/fuvubatadejabedux.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/44589526845.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/af14107704046beb847a2007250613e2/59326381047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=another+word+for+give+away+itemsPDF 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_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 11000 bytes
SHA-256: 95d2b4b9e858ab251aef0cc85f7eac8e6aa64a5e2ce7178aa19fe6d33022698f
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 19988 bytes
SHA-256: 4789347c329a10f0c99802d43684d760f227b4833ddbd13f1b1ca98e64c647df