Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8845c7a6b081f8…

MALICIOUS

PDF

82.9 KB Created: 2021-10-06 05:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12ca65891e37fa1dc504a176d9acebcb SHA-1: 1ffe53dbff2200067b29c0e09dce07f54b7a23ca SHA-256: 1f8845c7a6b081f830ebaaaff88adacf8856c351e6bb82afb1e9304abdd825a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://wastran.ru/uplcv?utm_term=unosupply+oxygen+concentrator PDF link annotation
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/walabamuzela.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20211005_B198178120C86FFF.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/3453288558.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30f3d0c7f---pekujejaj.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/57937974134.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/gefoguxikik.pdfIn PDF document text
    • http://prosquash.by/data/11593082567.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/kunobozojorebirofim.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/pipiluri.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/37728542626.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/44266898147.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/94398780277.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/35522721691.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/medipezivuwo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a3810d61305b97a2578a33eaa6d480e5/4277580581.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/df640a7e639e3403a8467d4929b804bb/22024341971.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/runosawefof.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/25907046426.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a071d968a01357dc2d496dd5d47dee86/70962180584.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/79932235066.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/42512291999.pdfIn PDF document text
    • http://healthywithhart.com/res/file/47553102873.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/615cd9bc87ccd.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615cffae5d4f6---jotuj.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/tegimopelof.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/46886698464.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/69b19a4d644368e1868ff68e62ded1cc/lovoluwoz.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/376a6b83cc48b4c5db097f976b04bede/50238776232.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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 10780 bytes
SHA-256: 5825a535305b0dc852c45e7b083a10aa605d4ffba365572948dc05d297b07c29
font_01_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 17848 bytes
SHA-256: 4d39116241afc4590800f1e7d955da2f3dc659564afc7dbc6d0ff3d6e20f5c47
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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