Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0176accaefeabb…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 02:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b02bbde66f27a89bf440e27749fc38e4 SHA-1: 9b0a47177a442bf6a8a6011c585a7f426e822490 SHA-256: 2a0176accaefeabb6b7b387050dda2d2309c7967bf1fc7af9508f0f4e7ea235a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm and a lure for browser extension installation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely involving a social engineering tactic to prompt user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wolfpackbasketballacademy.com/content_docs/daduzopa.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613979aa2edb2---98435735974.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/3369174035.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/41852849453.pdfIn PDF document text
    • http://brukbet.com/user_images/file/maraxemabiditeso.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/24124172147.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/59700180877.pdfIn PDF document text
    • http://ranch.pl/files/file/82744211126.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/radar.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/79752796395.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/darovidaxetuxibetif.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f9363cff---89355608088.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/fanumobuk.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/webojebilorefewise.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/86733658440.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/98101888323.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c408db66ff---64310913252.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/402db9e81d7eb9cee6c321ed70957654/tabirig.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/puwokivalibalaneku.pdfIn PDF document text
    • http://sbcnepal.com/images/file/69467329533.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/35917103672.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/86124056408.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/16508950432.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/15881057364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=boomplay+music+downloaderPDF 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_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 16144 bytes
SHA-256: 7e280dadfc479f9b612a8508e11fbf622aea69ea45d4eba3014f9a2bcf52bd39
font_01_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10932 bytes
SHA-256: 62797bbcf39b39b5d324bc97f1f75104d948a75d735ab33f3e296196f6e104ec
font_02_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1