Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f99e402e54bc6e0…

MALICIOUS

PDF

94.6 KB Created: 2021-08-01 03:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1168ae3780c45b2ce74dc8e3120396bc SHA-1: 36110c151272f691fcffffbbc1ffb913216fc61c SHA-256: 7f99e402e54bc6e01a52f59044f6eb9262ffc50a2b207587a27091bc233c1aa6
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160879a2817503---92733354827.pdf
    • http://www.aadhar-interior.com/userfiles/file/logusexekoletutuvigozutaf.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d7327ccd---95403783041.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/60516040897.pdf
    • http://waterreducer.cn/d/files/14956843405.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/80518399407.pdf
    • https://eobliecky.sk/userfiles/file/duxiradarasim.pdf
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/42209005725.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/83163489787.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609198b395d6c---26050507444.pdf
    • http://jsdarvin.com/files/kituwijevividusa.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/acfe6d9524f3bfe8ef527cda1ae2e52a/suxenuxibumesazalusewakur.pdf
    • https://wineart.online/userfiles/file/zilixofetunujigefufoj.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j62t0hf5reekir18th3a3gunaa/51462547400.pdf
    • http://sakuragiramenandsushi.com/uploads/files/90560928512.pdf
    • http://bright-inter.com/file_media/file_image/file/weroxewonokivedekoniw.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5164cb6205---kivipobalaguvumavasokeba.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tuzosovugezaga.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994a9e2bbbe---jexejodixa.pdf
    • http://inse.us/uploads/images//files/pewewisofisuropogajufesad.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df828b4b9d4---sifefetu.pdf
    • http://sakuragiramenandsushi.com/uploads/files/388709554.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=practicas+basicas+de+cisco+packet+tracer+resueltas+pdf
    • 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_off00010bfc.bin
fac9dc0374a375b1a8e01ca1c1d88cf9106c583918d71f497ee171b7ff0e1a06
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 17448 bytes
font_01_sfnt_off000138b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B3 16792 bytes
font_02_sfnt_off000150ca.bin
b67e6c2154a3d26355ae6e3384b623151cc296554f8159374b1da17a10a26236
pdf-font-stream PDF embedded font (sfnt) at offset 0x150CA 10844 bytes