Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5618ffd76fef67f…

MALICIOUS

PDF

99.1 KB Created: 2021-09-07 09:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0d61ccae10be7a3884766074cbee150 SHA-1: d3603b2239e7ec25ce7b85f08586d54b023ff906 SHA-256: e5618ffd76fef67fbd15ad23e40451934a61d72b964d25bfe64bfc55d51c097a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing and trojan activity. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a potential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=workflow+management+pdf PDF link annotation
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/namigebunevujosu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/05cc892525938d293c63778385d9b94b/lekojavekisukem.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/58940393934.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/17187560610.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/nuwoginorenobijuj.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609db51fee6dd---wowedipezojuvi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/65617780802.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/315vrmmdcque2eln0gd2t5ube7/detudadapiladulujov.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ca3763160---84459609198.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8533271cb---27880970307.pdfIn PDF document text
    • http://grimastone.ru/files/zujamum.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/q6b3ctslvsp1h28e3tub44jv9f/sakavivukezivo.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/54654651412.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/62165324920.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/57rnt5f9tv802sla8asg4bap7f/sogeketikaxidon.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b98a3a5ae3b9f57051234d6478888aac/51031335349.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff892773ef---vizakolajesiwovof.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bv7d7ahma4qsgglbkaijd172b3/xapufanurepivel.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7bedd655095e2022a96513ec8a85bf47/93524671924.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/60280337386.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/mubesosobikitavi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/m6cbskpf7ennjief6a39q17lde/91037134788.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_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 19044 bytes
SHA-256: 016b928f3428ea31f9c2626d8fa5365174f5ba3053f52381241a617bed5ab5db
font_01_sfnt_off00014e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001663a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663A 10752 bytes
SHA-256: 3ae5387ddad7bd7ccf092a0295802cede96fcbbe1edcbc8eef092b5fcc1452da

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