Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fda3470fc4d1508…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 00:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e2d013c4ddb04e5248bf1d7b9094062 SHA-1: fae1608cd1448c5888ce388c7beeef317729aaf0 SHA-256: 5fda3470fc4d1508570d37cc2b13427acc0d93bb20afd03ee0013530a7ba34ea
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd274ce50---xusefalukevelepufuzad.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91ee15553d---31974737387.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/85850416635.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161268007740d1---xusugebujoduxe.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/kalumijetukenazobufuzu.pdfIn PDF document text
    • http://uhorder.com/upload/files/juzozufavubogemumapefef.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/501dbb4c60f0b3b72025af31c9b3af76/bonebugawatokavali.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f1e73266---nunapiru.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dcjl8mslkd7q4ai66q44kecva1/neverab.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/vadumilupigirelikare.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/16559016631.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20218171857254503.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/4284819071.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/musajo.pdfIn PDF document text
    • http://cascad-trans.ru/files/14502366548.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/93803438443.pdfIn PDF document text
    • http://vo23.ru/upload/file/21486490479.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/42338888946.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/52634271550.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75a75d5b5488fa8560b0a52238ae81cb/33842067098.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092be154c586---12484879643.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/8075392824.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/20281424149.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c51a2b417081ab425269cb68ffbca1fc/70401277059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=columbian+exchange+map+worksheet+answersPDF 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_off0000c5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 16284 bytes
SHA-256: 7535b4ed20eac8a28ecb0a8729c0aba7fd3015600cca224d28d92fbcee12c030
font_02_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 11372 bytes
SHA-256: b4e6d2c8c6a07e0002b9a934650c4a7043cd9c569ef392d2c19a5f27f7ecb49f

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