Malicious PDF — malware analysis report

Static analysis result for SHA-256 752e632148e806aa…

MALICIOUS

PDF

85.6 KB Created: 2021-08-16 22:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dac3d72f3557750e9ebacd9f327aa1a1 SHA-1: e440ac20cfa193f9e37bd0db7f546a6e68e1b8ea SHA-256: 752e632148e806aaae98e43a9785649be7d411b484e35c9430ef5636d93bf8ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to various domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics (compromised CMS upload links, SEO disposable link farm) strongly suggest the document is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://drafthe.ru/uplcv?utm_term=ausubel+y+la+teoria+del+aprendizaje+significativo+pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/webefes.pdf
    • https://micsys.in/userfiles/file/67060015188.pdf
    • https://koncnc.com/genelresimler/file/wodaromefiloj.pdf
    • http://altiro.nl/home/tjerk/file/tusizukajojiti.pdf
    • https://baglab.pl/galeria/file/45199510101.pdf
    • https://hzautomatisering.nl/userfiles/file/41334026503.pdf
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/19260464799.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d580f05d---97479378720.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160961418a7aab---vusowelufefaga.pdf
    • http://alarmy-kamery24.pl/userfiles/file/tosabizobagowevixojuguluf.pdf
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/sesetakinotofimogolu.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/aiq7ud1rkd2sea65ldrcrc59uh/timivonisatanelus.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a785262589e---xozis.pdf
    • http://jcon-aps.dk/userfiles/file/21713717655.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c5af2106b6d63c0f2fbf08959df2bed6/ludapatitesowokijedi.pdf
    • http://matsonconstruction.net/userfiles/file/jetifirajilibabuk.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607212a10242f---vusamaselo.pdf
    • http://pphu-joanna.pl/fckpliki/file/73375864060.pdf
    • https://sedefartphotography.com/resimler/files/dufadofuvemet.pdf
    • https://medius.sk/userfiles/file/suzapirinebi.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/97a8f21cb868b70bdc552acb1f5d9a53/80159529270.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/12333398922.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2ba529a33bc10bcb95c8257471c79525/vaxebugotilegag.pdf
    • http://tradeweb.es/userfiles/file/puzapovifuwevaduk.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_off0000e7d9.bin
5ac68c13d0191f89a58ca1e19ca4974ed68389e36700b8bd0d61b437147b910c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 11384 bytes
font_01_sfnt_off0001027f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 16792 bytes
font_02_sfnt_off00011a91.bin
f9b63d993fdfc197deab4fdc0d444f1c32ff6acdb970e1be74f74782cffeedcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 16852 bytes