Malicious PDF — malware analysis report

Static analysis result for SHA-256 069e651aabecd35f…

MALICIOUS

PDF

68.3 KB Created: 2021-09-10 09:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f6b29aebdef1b7414e51600d053bc07 SHA-1: 2db40f338dec50c26eb298b841d4cd172c3d5f5e SHA-256: 069e651aabecd35fdb1950f72957322928755a068470e4fd8c7cfefd0d9083fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farms pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, likely for phishing or malware distribution. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://crewmak.ru/uplcv?utm_term=words+that+start+with+a+nouns
    • http://orthopediedelft.eu/files/59092845636.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/93713625349.pdf
    • http://jujucuisine.com/userfiles/file/71145105060.pdf
    • http://thaimassageboy.com/ckfinder/userfiles/files/givukakefevanosa.pdf
    • https://mmoxx.mn/userfiles/files/64484746982.pdf
    • https://altsovmun.ru/userfiles/file/76747375807.pdf
    • http://9275522-travel.com/userfiles/file/51881758867.pdf
    • http://musikpark-live.de/userfiles/file/difokatenukonedowabaj.pdf
    • http://stylekd.ru/files/11537195812.pdf
    • http://aerotechgroup.ru/img/outer/files/pekaxupujixifizoperude.pdf
    • https://theipbuzz.com/images/file/80481713524.pdf
    • http://macierz-grodziec.org/files/file/keguxudasalunerofisalas.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/34213228167.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/v0t1o4imcv0g3mntf675uhb72a/98053577225.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1535c1d81---fizewakapajuxufaweno.pdf
    • http://web-news.eu/www/pkpar/userfiles/file/79840028928.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f296aa1e4cfe17e7371f33dd68c8be57/16902091619.pdf
    • http://tottazo.com/userfiles/file/gejizesosabikerade.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210903_060445.pdf
    • https://xnkvinatimex.com/uploads/files/72670155772.pdf
    • http://sevimticaret.net/userfiles/file/36107365734.pdf
    • https://jagamimpi.org/contents/files/jaruko.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_off0000ad5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5A 16792 bytes
font_01_sfnt_off0000c571.bin
aa1118926c306361a466e0b23b2dcb902ff9bcb201a0e8ab6f709507b85e2a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 10348 bytes
font_02_sfnt_off0000dcc5.bin
d4dbf3ad015c5ddac92d2088ace1e21d3d20111791ebe08fa634f117ccb18b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 15520 bytes

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