Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0249052448a02ec…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 20:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d8cb14f77533f073a2c1ce90d010d19 SHA-1: 49ec322a3e72d4f9caa970dbb3c8faec98d83995 SHA-256: a0249052448a02ec6acd56a8c14764dd48ebf2ca5c29c60b5a1f5ca13853e542
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, some hosted on compromised CMS platforms. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document's content is designed to trick the user into making a phone call, a common tactic in callback phishing and tech-support scams. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=clear+cache+from+all+apps PDF link annotation
    • http://sangjeom.com/userfiles/file///31093064530.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/65514874831.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/50266334235.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b76317b89---basidikulizizuteripenu.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/dozepoxasuxub.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/maganikip.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/vuruzigafamolonekupaka.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/gavobiponetidowa.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/23724276689.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/tepuzobepejuwagu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/77fe90e2886a9117d6655ce576c0be3e/mepafewezor.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qjq9cm5v0eg55d9v6el1us7kqs/tefadeduvovasepesuwajijex.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/15416369166.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425bf7e4a11---25473885897.pdfIn PDF document text
    • http://contelex.it/userfiles/files/64594555953.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/40230107268.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed2466f04---fijizupajirijudibosomozin.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lomoxul.pdfIn PDF document text
    • http://stevis.cz/files/file/puvagelexi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109040758022748.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/waloxizagumisekadaje.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/34407164421.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_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 10484 bytes
SHA-256: 156ce5ddef6269796dcecce984c48a4d1a1f7af52c8a15ee0c5f11b6630526e7
font_02_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 17176 bytes
SHA-256: 134d37a3d55ca997c2d7b34bafad3dfec3e9d8ac9e8c0b111142e7d155e1a90b

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