Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd742c175463ae2…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 20:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4e9c446e2d57cec08d1df33545cb078 SHA-1: 9be49c3fbd4259c1ef2257a42c94a0ec2edd6506 SHA-256: dcd742c175463ae242fc60d16946b333082e45de36b7242a5b173069fc517b13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://chcial.ru/uplcv?utm_term=boruto+ep+120+dubbed PDF link annotation
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/56f1736683bc0c1d21741c1f2dd5a96b/58887817978.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/bevapiva.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/sawapafavog.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/rojopojenu.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/43378949208.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/10536618055.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/wexosaxibisudotu.pdfIn PDF document text
    • http://baoveantam.info/upload/files/75593350499.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/88435389639.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/44156495356.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/57876968326.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/49688640284.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/togawaresigewona.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/nidilinin.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/zenibokamufef.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/laloludigotuzijis.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/88680146740.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7355f78619bafe4e133adc9f919bebbf/lutajujuligofug.pdfIn PDF document text
    • http://intertribo.sk/files/63572983461.pdfIn PDF document text
    • http://vhktn.at/images/content/files/83792425429.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ghnsrfmaib3cd60nr1h9vpj6oo/50752724727.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/xakizedixulopaligaj.pdfIn PDF document text
    • http://wwsm-us.com/files/file/beloderogexanunaguvefa.pdfIn PDF document text
    • http://salkim.com/userfiles/file/fevinoxix.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/55238566257.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613878cd1345c---fajejaka.pdfIn PDF document text
    • 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_off0000bac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 17084 bytes
SHA-256: a5ae0806ccffaf384a0bb5a5d44f0649fb4513d2007176993b8ff2ae780e1033
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 10400 bytes
SHA-256: 4eb3f38c18741d5a4c8a215a64f72d00645e977b8a61ccca93d5ee0945d4e07c

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