Malicious PDF — malware analysis report

Static analysis result for SHA-256 649a03427f471e03…

MALICIOUS

PDF

91.5 KB Created: 2021-08-14 07:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d919158c6b24dbf6df56c9b65f4ba8d8 SHA-1: 322f309b20b16a2fc99fb88b21dde14b0bdf7bc6 SHA-256: 649a03427f471e03669f732201ec220180fbbc30f03be8a0f197dc44b83fe33d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for fake issues. While no scripts were extracted, the presence of numerous embedded URLs suggests a phishing or redirection attempt to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://irlanc.ru/uplcv?utm_term=acer+chromebook+spin+11+not+turning+on PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdab3a287d7---rugigutifosevowovubuj.pdfIn PDF document text
    • https://soechi.net/userfiles/file/jedunexixatevidanaroji.pdfIn PDF document text
    • https://zzhqhi.com/d/files/30359536253.pdfIn PDF document text
    • http://canoeing.by/pics/files/76534023181.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac567f32261---juvabe.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/97c5cda6d9d1cfb3341dabdb606e49dd/seratiliseritugipilokodus.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/13891359453.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/30746204658.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e33edc254---mapegoxoxitovenizu.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/42339411417.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a5c85aea---xixafewelevu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9432c693---57438012890.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3a4ed9bc---femujubebumox.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/lprskaarvnjbhfahslvijva560/rukutajewetuxo.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/89173950093.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vitapeniniwam.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/39801758294.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/duzoladuzawobiziwudurarar.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biravarumutukesifije.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/23577364545.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609febfcb7dbb---30869759862.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608705862ff35---388220430.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f3618f6b6d86f2712d5b9231bdf2c358/55199163031.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/62d15a21d6e87ce28acdcebfd94387ac/xidepituf.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/84852977111.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/lomamujodat.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_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 18296 bytes
SHA-256: bd18b6937fc5e506c0150624372f92c266f504dfc9399c26cee21700379d4756
font_02_sfnt_off000143e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E8 10976 bytes
SHA-256: 0c3136e0b8dd1434a3c85b3cc7abdff213b05b580ff2b1304f0b4dd7d1a92603

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