Malicious PDF — malware analysis report

Static analysis result for SHA-256 82140c19937cd02a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 20:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9deadb146269420a185bd5b08d7248f0 SHA-1: 1d21e600785d9dd265a6b589bdf0329eee5d6bb4 SHA-256: 82140c19937cd02a46beffff92deac892285aa517f26b9aa880a133cfaf0a060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are commonly used to redirect users to malicious sites, likely leveraging JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://laborke.ru/uplcv?utm_term=determiners+year+3+worksheet PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a664865a3ef---dilagirinuwafo.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/rutirabewedo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc054cc6cf---vufetelegoniponujuvi.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/57613942392.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/93999120978.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fapikajoberofigibulax.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/87194233093.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/finosipaxi.pdfIn PDF document text
    • http://hasyo.net/files/file/roluzizukilijuvipekuxen.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608132580c8b7---vovabasajajotimemogujode.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2784142c0---57877612899.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/17201686119.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mfkoek2cva03aqonp267ob58bs/26233202072.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/427387919.pdfIn PDF document text
    • http://canoeing.by/pics/files/77389241448.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/xapopi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01c0487d1---fakajedanu.pdfIn PDF document text
    • http://df-foundry.net/d/files/wipikij.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6c1157c547010c35d5a1d7a2190b3c36/11523746257.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e638f81c---92152976284.pdfIn PDF document text
    • http://yantrasearch.com/ckfinder/userfiles/files/nupikebepovorifijobawaki.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lmgnu1uve9c60rn9lce1qkjo57/69477036616.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b748c46f6b2---kadapuxif.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/jiniworagepapijojabib.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/dulililekik.pdfIn PDF document text
    • http://berbun.com/user_img/file/giloduzanom.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/93047383610.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_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 10792 bytes
SHA-256: a32785574388e84d72ab76530efea94cdbe113ffa7720f6602eae5af753f12e5
font_01_sfnt_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 17076 bytes
SHA-256: c08700136e1ded1b204d85196a29a85276c84103341b4ed5a55331dcc54cb711
font_02_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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