Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f03aa66f72b225…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 00:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38651bab632d5112611b425efb37d951 SHA-1: de74b620f812d2647f18232d872c2652cf13254f SHA-256: 04f03aa66f72b225280f89ac6aa01c5360f78608229676d08ed8d4f945c5a57e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised WordPress installations. This suggests a phishing or redirection scheme to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/430aa54e050cc1c335d9d026ee7bc1f2/taxazotebagemo.pdf
    • https://www.sterlingsez.com/ckfinder/userfiles/files/jefun.pdf
    • https://groupunsur1.com/contents/files/pudunenisevan.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/glrv4q833silh26upn3ho3m7mq/38809692891.pdf
    • http://alituncer.net/userfiles/file/pisukugolarebetapexawoza.pdf
    • http://palenice.net/obrazky_clanky/file/ledegakatal.pdf
    • http://prime-standard.com/piceditor/file/lufulipufazefabo.pdf
    • https://marupyara.com/fotos/userfiles/file/3552510332.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160746ba2aba30---vawulo.pdf
    • http://www.allatpatikapecs.hu/images/file/29118419508.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e863837c437---vaxugabopigofoseguka.pdf
    • http://haciogullari.com/depo/sayfaresim/file/wuduvake.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0b0a94125---vefegojo.pdf
    • https://ayurvedaemart.com/uploads/file/15562511910.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ticr6fhvprmp6s65dkhvpbv8t3/78280802190.pdf
    • http://futsalcb.cz/picture/vtextu/file/75148966237.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108bee4e15f5---43639001382.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16124a4ed4edb0---97341088966.pdf
    • https://norservis.com/files/files/tisegiperetavifoxivibibe.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160eda8809561f---gipirorarakolujaka.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16078d81a188bf---1330035114.pdf
    • http://woods-china.cn/ci2/userfiles/files/20210821025342.pdf
    • http://prmakeup.com/Image/files/92700092497.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/jogalaxaw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=corticosteroides+definicion+pdf
    • https://medlineplus.gov/spanish/steroids.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc68.bin
cde229803f76e5eb74336f2d74882fd48037cb9b7ceb89529fd98ad028b5c853
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 18388 bytes
font_01_sfnt_off0000fbf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 16792 bytes
font_02_sfnt_off0001140b.bin
803f65281d58a581c7c66e19ef9a30b15e9015e3418f2606aed0c36890e9fa24
pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 10436 bytes