Malicious PDF — malware analysis report

Static analysis result for SHA-256 51be6af3699de9d4…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 03:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc78fbe37ac72bff8287bb957d9fdde8 SHA-1: 4d90fabc215395678a04a6d78213a88b36309b52 SHA-256: 51be6af3699de9d46a223a018c03e7c2c459093947514487b33636f5fddb3464
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as a phishing trojan. The embedded links likely lead to further malicious content or phishing sites, indicating a probable attempt to distribute malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://auxerretv.com/content/public/file/joferexebaposafafikajo.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6794c8088019dc5dbaa0cd481f21e4b4/5365291010.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7748012af2952db73fa05432aa65e14f/xotujat.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/504d037a6c23c5495cf01c1157717a1b/kisazavegarofopipux.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0ecc9e6e17bc4127b0fd8acb25b98111/mufagus.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210609105842.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e871877837a5f7359dcea586ef003c0e/1061229570.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35e15ce569---96367470923.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/51503431213.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c5824710---7549398406.pdf
    • https://aplusadvance.com/naver_editor/data/file/venizixuxufot.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/rugarezazanobo.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e892a420---risefuzeganebanipoxak.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/808c5e55ccd8196c95bb9c4e56cbcc61/sadizewuxowe.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb9a98877---30362996575.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104282304051148.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf7e085b1---laxopidifujudolodafukigi.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c679c4863---kemuse.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//65389291335.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607de35fd85f1---3295662801.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dmaued4m7f2f7mtrtun6lsljjj/xozatedatag.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d5c7141682f7085b80de4260141a6ddc/purom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+fix+over+whipped+cream+with+milk
    • 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_off0000f597.bin
b4d5a80a3ff628334b18d1a92ddb1f3b51f8ca6285bbe3ea391efae7db12bc1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 16876 bytes
font_01_sfnt_off00012127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 16792 bytes
font_02_sfnt_off0001393e.bin
833d4c3e49bb967b034ba07b6105dbf58c654b65b843c9fba58331f4a598b762
pdf-font-stream PDF embedded font (sfnt) at offset 0x1393E 10952 bytes