Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e4647248db91c…

MALICIOUS

PDF

80.6 KB Created: 2021-10-14 11:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 90a2423584baf298d505b8aa5576543a SHA-1: 2b5384d47bd32ba1ca8a76d3b3bad7bcc51c87a7 SHA-256: 169e4647248db91cfe1895aeda85edca4786bfbb734c5f5d9e711d1bf04e4e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=the+beck+depression+inventory+ii PDF link annotation
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/zurolekasebafanizusifutux.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/fimew.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/45422536715.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/66276306252.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/37620034122.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/73647642943.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210917170410.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155675b010bc---jofowanonegirenir.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tudigujufazite.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/kurujidogufoximivilaxar.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/87837787834.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/molusujalesipejaninixud.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210925144604.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/45236216009.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/nasomulodogewixaxaniji.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/85382253116.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/toxikexipusonedi.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/divuxisamelos.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/50127141800.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5130c66a9---997968340.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/robusu.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_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 10780 bytes
SHA-256: cf93b73cb83d076e5b5dae4d2f1ff780bb5333ffec17e4af25a87a68b96fbe5d
font_02_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 19084 bytes
SHA-256: d2d04473a8deefa676d2e70d980383cd4957be2d1930ada9f6ca6d5647b14c3d