Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada4245a571e0920…

MALICIOUS

PDF

84.5 KB Created: 2021-06-27 16:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d29c92ce0a357869e52d4e5dc0a6719d SHA-1: 9cc222209ebba51ea1dc68fd296f433646ea3417 SHA-256: ada4245a571e09206aa279de8ca84ac3e201658f542a93359b85512fea31dba9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d83d5974a0e46b4036cbc6397218f19a/tifuwexafegidubivafuliraw.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c97700904---madoduxuz.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afe815296d1---dejoximesigokitaweluf.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c2e5349f59f436ecdc70028898dcb707/kixejurigujerafubo.pdf
    • https://bibliothequeanglaise.org/upload/files/rowadozas.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/79057133153.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd4f134882---matuvura.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078653edb853---62191279831.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc6550f30b---lejefutis.pdf
    • http://gdgom.com/upload/file/2106200227229899806721u17bws1p.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160753b45510a6---16453015711.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/31117683175.pdf
    • http://schodylux.pl/userfiles/file/paponakuvimukem.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mf7o17e71ch5cuqflrm08l7vhq/96767866809.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/197ff8b3f9e34f6b0e3b4c4fea1867df/88375748543.pdf
    • http://www.biotanika.pl/upload/file/20832514541.pdf
    • http://ayurvedicclinic.org/userfiles/file/78111268371.pdf
    • https://aquafilling.com/userfiles/file/pavuwulerijiwoji.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83bc323c0---suliwavezekomijive.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071deea0a52b---76158919244.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b36df5c3fb6---42281737121.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b84c6ed97---xoped.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+contingency+model
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 16792 bytes
font_01_sfnt_off000103ec.bin
3af9ba7ce4c2952e695effb118fa43eaa9ad4963a5d52891578c0838405a15ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16176 bytes
font_02_sfnt_off00012d93.bin
3321d274c98413cd7251b0850c9c980da28c1ab5d984c841b68c609afb2b51b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 10464 bytes