Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca7e2e5905b7727…

MALICIOUS

PDF

74.2 KB Created: 2021-08-29 01:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60235b59d60938dc6b4b4a0b4416ff26 SHA-1: 58f4d799dd79a980674ebce18ceab8a538445e0d SHA-256: 2ca7e2e5905b772709593833c7196173f2a931e4c8cf7a38d0fe4907f46add7c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to lead users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archimax.ch/dynamic-images/cms/file/jijik.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a636ba895---zizogapulonisumesonisebo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2328f3aa9---99400434057.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/sotoribup.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9cac257c1f69742000630f8d95e6f3d4/35643651863.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd82523b2e7---somelux.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0462768001620346120.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/78e47f8ddea8a7ca47aaac2a2ebe63cb/dujev.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8e96b633---xisulefu.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pexotuzelemerek.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/joxir.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774855710ea---16092292838.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fabf3b041a0---wozolina.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/o9runhqpv2tt1ea7onpv1tv5so/28567254939.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/53463086676.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/barufedef.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/saxekuselap.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d1f8e2150---99344285091.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb96aaf2b---37279989055.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/96893270507.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/24650779924.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad11c6b722a---64186753962.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089462482c05---29194048458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=blood+cells+countPDF 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_off0000bd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9A 18320 bytes
SHA-256: 3ca092b947271708827ae6a3509cd0e22f016c9e2b451ffafd74491bca506d16
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 10164 bytes
SHA-256: 75225bf1c089900aaa9093ec362035f8d650d1d1268fd51ff746d89ab1cc86ae

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