Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a950903deb1091c…

MALICIOUS

PDF

74.2 KB Created: 2021-07-06 20:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6cad741dd0a8bbf93de551506b11131 SHA-1: 68687c174bfeacfb3f1519b487b82e28d2f6998e SHA-256: 7a950903deb1091cbb43b3ee7c7396753f2c795231c9e26b56adbfe5de678fc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=contentment+in+tagalog PDF link annotation
    • https://efficimm.fr/userfiles/files/90206978247.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7ef9b738---teditebesakajanivorifo.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/radawepu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/g73gic8r78racg07rmfl2mul5r/12393453755.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d372f954---nazukelexir.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/guvazakodapotupexemulajed.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc23a796bbd---65234729958.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/86443276435.pdfIn PDF document text
    • http://runo34.ru/attachments/file/gaxejumonizupifuwi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ea56a889d53ba2f63d18531ad3d825f0/dodudavipamijowivu.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/97143013546.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ghbd8gcupe273mp4umsjkn9la7/sodaxaz.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/zudavekebefu.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/xozapevari.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mt5bp56bqggkcshep4nqv86kos/88578594486.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-21/20210621155815925486.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a1fa2e1143983fcc46f72226e5920781/sabulusugedenu.pdfIn PDF document text
    • https://bonacorsi.it/file/nivanodugok.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/bififuwamawalolok.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/11902195466.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/18090597920.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/af796f71f1cecbb2024cb8b568f0e473/tufujonofepusox.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/47721246807.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_off0000c104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 10216 bytes
SHA-256: 1452bf2a32ca25f2cd3d60348ff893637cc831a38076309b164672fdecd57fda
font_02_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 17240 bytes
SHA-256: db2799d8f7c83a316d9b0968bc02b064d8bdc3beae10a2b1d5f56f3601eaf5c7

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