Malicious PDF — malware analysis report

Static analysis result for SHA-256 298a5af3be8e98a5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 08:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9193b53765f26e8228ea9024cde73807 SHA-1: bcdf8a1c20fc966a14158daa6cfa2b9c579338ae SHA-256: 298a5af3be8e98a5fe4a54b6ee17cfaabe2f792cc47f8608d8073b8185cce044
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these links, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tgsjknrhpqoqktckopfp30rbc6/lopubakoboruwukuv.pdf In PDF document text
    • http://geofer.eu/userfiles/files/68803846970.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98423237176.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/fobusisuvojerubawimex.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/86753520073.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67926382733.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/20656567407.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/nizupulogu.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/65602635962.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b2d1f3b7---62123559674.pdfIn PDF document text
    • http://rayer.cn/d/files/6151461836.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/vaginitejamipisu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0582c41b---31003933803.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/32542660866.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cb81fb89---55829906877.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/16490312016.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021911103776102.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/86665268462.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/wibodul.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/ruvarumel.pdfIn PDF document text
    • http://turatabor.hu/media/xesoberalefimebe.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109031954553993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fruit+ninja+classic+hackPDF 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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 10372 bytes
SHA-256: a79737f33d09a789f466d27859502885b4bf93251cad22a9f673b867b0b6b19f
font_01_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 17728 bytes
SHA-256: 0fa8ad3d79f93532ee6860aa654c9126fe2bb9e81a94564b5776f733467cef00
font_02_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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