Malicious PDF — malware analysis report

Static analysis result for SHA-256 2959527c3ac172d9…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 12:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b4e693dc33b9871d28b26f6267df234 SHA-1: 728d4e40c489cfd386e6c1a68bffa2dfd4e1bc42 SHA-256: 2959527c3ac172d962fdfdb2f83d3106dd19ab02f3e602faefcbb055182fb95b
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, some of which point to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this. The embedded JavaScript likely facilitates the malicious activity, such as redirecting the user or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=jurassic+world+fallen+kingdom+movierulz+telugu
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614569c842e74---8871352945.pdf
    • http://rlangkhan.com/upload/userfiles/files/72056382499.pdf
    • http://sasnowosielski.com/ckfinder/userfiles/files/pofarido.pdf
    • http://sichera.eu/userfiles/files/71631924504.pdf
    • https://vas-vill.hu/userfiles/file/97742105426.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/88859219030.pdf
    • http://lagrupacio.cat/file/puxadovetogodarod.pdf
    • http://radecznica.pl/userfiles/file/97145565730.pdf
    • https://itscebu.com/upload/file/20210908193533.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/wozivajegazujodog.pdf
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/19815021306.pdf
    • http://drentmedischadvies.nl/uploads/files/71540622426.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4e97421b---60383344384.pdf
    • http://dekobonner.de/userfiles/file/nigoxodurajuvudikum.pdf
    • https://rivieresoceanie.com/userfiles/file/sokowosijelerope.pdf
    • https://arhstroi.by/uploads/files/lewewefupebuzasabopobew.pdf
    • https://niagarablock.com/application/webroot/userfiles/file/newupomovilulewasor.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/denutebemur.pdf
    • http://originalbau.hu/imagesfiles/50183209558.pdf
    • http://exteractif.fr/pictures/2/86799385805.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161351288f0843---kedaraxiz.pdf
    • http://residencelesaline.it/userfiles/files/xuxafejomi.pdf
    • http://rspon.pl/images/wyswig_images/file/30720794775.pdf
    • http://zge-led.com/luodan/images/userfiles/file/76461144405.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/53030966505.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_off0000b808.bin
5bac11586d3a2a2ea0f3f0ae801352d824d1b134977f8b7cb20eec7f0921051d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB808 16860 bytes
font_01_sfnt_off0000e380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 16792 bytes
font_02_sfnt_off0000fb97.bin
8385e35ca794296e85194d1db36489d9daaa2f99ee96118df7d21285dffc8008
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 11216 bytes