Malicious PDF — malware analysis report

Static analysis result for SHA-256 d747e9553582ad60…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 18:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 698d848d1b296ce56726f9fdde9040e2 SHA-1: 0cab667bc3f4485a81d392957df2cb7b5c459b5e SHA-256: d747e9553582ad60cb7eee4d1b408b5569044b0b87fc76f34c46447bd304a332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://kantoromega.pl/userfiles/file/99909771877.pdf
    • https://www.opsclown.it/ckfinder/userfiles/files/33860069125.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/81c3937dec511420989b21a0c4d85e30/53122115420.pdf
    • http://akwarella.pl/user_uploads/file/470200434.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb9fa9f72c---58221987142.pdf
    • https://villanakarin.com/userfiles/files/kepawimoxupo.pdf
    • https://sssmri.com/ckfinder/userfiles/files/94203763543.pdf
    • http://pileshoppen.dk/userfiles/file/8414910694.pdf
    • http://shesob.com/file/files/98535140149.pdf
    • http://iseveranscopy.com/upload/editor/file/76245035332.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125ae7958389---kujivolojixixilemuvuze.pdf
    • http://studionegrelli.it/userfiles/files/vulifadagevir.pdf
    • https://jmtours.co/aym_image/files/lusoratubagesewapexoxapo.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99efadba70---pitojuxifafegeza.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d736acbe5f---salezinit.pdf
    • http://jgbt.us/pds/userfiles/files/97663577440.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0095141c71f397543ef2090373e6da1b/88114777121.pdf
    • http://studiospazioambiente.it/userfiles/files/xatuviwivumozumifudegudo.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c9fd72157---46620992835.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f49a8eef3a5---panutijibidefasuzasutu.pdf
    • https://samngaimarble.com/html_upload/file/42092130957.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/50lso8k19l9lh1h2qphir097gc/rofovigorokapopivenopoz.pdf
    • http://sukhonthip.com/file_media/file_image/file/latefofizexunogobigi.pdf
    • http://screen.by/images/file/18367785281.pdf
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/ludimaduf.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210719_6BF7C415113AE61A.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=standing+waves+worksheet+answer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 16792 bytes
font_01_sfnt_off00010fb2.bin
e9856e13be5dd9bf02b8eaf6fa624d0fd0941d74773f6a453ffc6ef517160779
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 10800 bytes
font_02_sfnt_off0001285f.bin
abb55c99312803a95f32c4fc2a3e0eecfc483d5ea33f5217168eaca45d0f27a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 18364 bytes