Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfa07d9744fc2cd…

MALICIOUS

PDF

102.3 KB Created: 2021-07-04 02:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7ebb2bb712378625ec492ba75d1f076 SHA-1: b884890ff787aa83fd574b760e43fb3b01da3498 SHA-256: 7cfa07d9744fc2cdd026f804533eebed46de848c99f551056556366c52203b07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://debeleven.net/UserFiles/File/wudolowibigim.pdf
    • http://palenice.net/obrazky_clanky/file/74351077464.pdf
    • https://tort-art.ru/userfiles/file/medoxufegip.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/817tj01ojh37oi73rhqcngr1tj/zekivotugulatate.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4f43b323---sefejupiwolemeb.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210523060056.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bee5192b---32031064388.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec70c4e8c---koregedowusuledeka.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/46857867373.pdf
    • http://gfhs1978reunion.com/clients/56625/File/vesenowebegatuzawofuva.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1f2qfnab97pr6un6m3ei8p1e75/52125003226.pdf
    • http://ajivikafinance.com/userfiles/file/zufesirileruda.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608979634b8b3---66471159853.pdf
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/gaxufuvedi.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd71f70e20c---nepabafefonokolikob.pdf
    • https://sonarmusic.hu/up_image/file/gasunuruvujonot.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5a73bf85---7168955602.pdf
    • https://amatnieks.com/pictures/image/54799776379.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/23312363597.pdf
    • http://tms-operation.com/upload/files/davetebasefazoda.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/90829531634.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607995c209493---84446692342.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c46b67b7687---38018678544.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=determine+if+differential+equation+is+exact
    • 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_off00012b81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B81 16792 bytes
font_01_sfnt_off00014398.bin
741784e82b75a21367bac8c3a74c3aab8676605e00dde35bcd0011b464588ea8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14398 10984 bytes
font_02_sfnt_off00015ce3.bin
295a0891c47e4cfd8176c08314bb266d5659b1db6337efc8ef91a6f7cbfc4aa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE3 17612 bytes