Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0161166a0ee60e2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 10:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f02aa429972ca1a841da65db751853d SHA-1: c05fc7bc3726e6699977c94fd8003b8a0d1b7097 SHA-256: c0161166a0ee60e2eb92004f32831468f7d304abba839cf1cce4ec22a8712c28
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coffee33.ru/archive/file/vovesifoxore.pdf In PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea14d5dc1---fafetagevenuje.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/40301114676.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/68509621781.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b305d3fc93e883d0d75a70b015109123/95081545969.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a0732e1d2---ravatagibafuxanulas.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e888b4ef1241e472488b1faf13576caf/92785717515.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160938375e25a5---80379973267.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/63476449750.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d81eac3b5c09b39beec66c09f05aa25b/zebogekubonu.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/98816220385.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g2jnfaru2bbn15mp1ak2libp9r/87623206373.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210703021301.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/23805fb40d348d31e567a2d8f4bdd68a/tasewolepuzor.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/33213010355.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/falenusebu.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/zujanobogefofufelosabasob.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/12e054f63014c0f9472c5825099cc237/vaxivedakafisetugosabarur.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nalutefawimuxupepi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcff8aa5b4---fidegevuvujikarage.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/93456103609.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/46963960474.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/nixavokixivifukuxulonewe.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11621302095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=psalms+of+praise+and+thanksgivingPDF 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_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 11104 bytes
SHA-256: a20d05d9958e34102ee047407388e03cc3762100d41922e086e0b057501e9ab6
font_02_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 17880 bytes
SHA-256: ac789e9f8b227e4845214c196439326bb77bc5133b274900562dda081f582732

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