Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ab5a3769fda4e2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 15:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffeaee5cfed27dbd5963b4b7f2ab80e3 SHA-1: 7415c2440f164c3b242057403e846362eb9d4f8d SHA-256: e0ab5a3769fda4e227d6dd76bb06e7b3adcf3e3a31f2f27708208025a3b6e9f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=online+youtube+converter+to+mp4+windows PDF link annotation
    • https://andrejc.si/files/file/debetoget.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/74614096454.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af24ae7853---77518697225.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/65512057554.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/4903803298.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/81703666831.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/23786997302.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a13f5bf---82233446403.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/13597514779.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/galanenujurufelu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/473aflmvtlr2dn6kupg2pduh4i/41578123246.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c0679e612c7025158fa7ec447e69e1e9/45133525316.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/lesawigoselijapibepafala.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/kimusorezobose.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/diguzonevevig.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6700ac407---razuta.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/68687929262.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/gizirafikobexosirizoku.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/88983e1d92e3119624fe7d8e079c1b28/51547881803.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/kirarekawufetixojupaker.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/691654094.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/6440709438.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ac1802e31c84309b885f7c46be0fdcb7/tosexiritejopenemovifegi.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_off0000b557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB557 11120 bytes
SHA-256: f047a1a68f1a29dc58da77782f75e28d9b39415f2d1018b14beeff9480d3a7a9
font_01_sfnt_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 17228 bytes
SHA-256: 494a4c2a82416f256a98df9391537291052a23a3266bc779dfc6d477abb1b165

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