Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f70efe3baa00241…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 19:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 049410d929904e99283e5ed3bdfaf608 SHA-1: 8084433de4e26669cbd5361869ad2cd76499d22c SHA-256: 6f70efe3baa002414c9b56e7b6232160d22a6f1833debce4ff78fc46bf09860a
96 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it functions as a link farm, directing users to potentially compromised or malicious websites. The ML classifier strongly suggests malicious intent, and the presence of external URIs and compromised CMS upload links reinforces this. No scripts were extracted, but the overall structure points to a phishing or SEO abuse attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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://saleskerala.com/ckfinder/userfiles/files/godef.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/sotisamujoj.pdfIn PDF document text
    • http://pedraferro.com/files/files/runulagodawapevudurofana.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/guwaxus.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/75897437787.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/zewigab.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/48676005.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/id9r7r5vm84kodtnl9i1352dj6/59827116976.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/18795633460.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/30343905896.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/mosinevuwomibuwureluzidu.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/vipel.pdfIn PDF document text
    • http://373113.linker.tw/files/22832098401.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210917_C46D9E098B9D48E1.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/96959823705.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/58409981502.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/dijotaworibovaveg.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/wuxepomezadavore.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/medumures.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/puwulinanedaw.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/fuzanaxudim.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393b3228448---jejava.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/472526ff97be769ab0219282e152feb5/26905242819.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/21632638897.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/31273843793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=indoor+positioning+using+sensor+fusion+in+android+devicesPDF 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_off0000b03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03D 14964 bytes
SHA-256: e80930e5b356e9fe77dc1afc3a14e886831806007496cf29b93d8b534f02ae30
font_01_sfnt_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10868 bytes
SHA-256: 50c7efb46211951b1451f146f66bdd4e5e6e9f7603bcac23b606e85f2e3a5539