Malicious PDF — malware analysis report

Static analysis result for SHA-256 90376f50644a2694…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 09:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5d61527c410426fc5def9fb3bd314d0 SHA-1: 0ff2e5a1b370c86301d27b1f464a1f6262cd1489 SHA-256: 90376f50644a2694d5df1651fb1f64cf1b4d3c89f9582ea21d306f99bf30f9fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://acudrved.com/ckfinder/userfiles/files/kuviforokikarutu.pdf In PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/60584078207.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/59100720237.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/74379514221.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/74225037811.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133804d5b490---biroritabese.pdfIn PDF document text
    • http://ausafe.net/images/art/files/71389362518.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/33342778966.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/jafizomixaber.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/jovoxakenuposakewo.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64855193095.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/vukukapexoko.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/pugobagiba.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/17630472025.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/46437892486.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/gofuravavitanivisuz.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/1368359088.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/nameje.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/op8n0fk95lhauff3aedatt7gpp/guraravizatojuza.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/sizolisinibeduxi.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/i8j91l3uk49f342c7vmt9p6ndn/43653471664.pdfIn PDF document text
    • http://zuszdounky.cz/files/razedun.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/vosikaxofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+spy+on+android+phone+without+installing+software+freePDF link annotation
    • 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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 18296 bytes
SHA-256: b0f7f1e179174c0ca7fefd471ee04550c67af3e92485b1a8ebe209ba7491f672
font_01_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 11068 bytes
SHA-256: 8eef78372e7610bd787eb12d7ea095fcbf9da3c64354697ee58c31024a4343f2