Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b38d8bbf03c4f0f…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 02:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1447c4367d90f85754673248b436f455 SHA-1: a4ac2fb406fe4296a835896dd7e39272258790de SHA-256: 2b38d8bbf03c4f0f5f46ea161ad0290f134483858d5594d5480cb35601853890
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is used to distribute a secondary payload. The presence of external URIs and link farms indicates an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa8b4ffe5---45089234700.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f95c1df01---94057930753.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fu93b12409qhq4maa8vgsj2qe0/fererajepagavuvedutef.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/bokikafolomapu.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/70b7de67ff5a458038aff85013143dd6/59717399103.pdf
    • http://nuraski.pl/wsg/userfiles/jojatujalodez.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0095029a---gosixetevetewili.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/79061ad82f134f03d5ad71e72cca79d0/bewagisejakem.pdf
    • https://dm288.com/slicice/file/dabawox.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4tnu27t6l56rifht3q2331eegn/mozedekureguvogosen.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f94adc2da2---22879426828.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/24010038724.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae03f2912e2---7015964567.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5e26429eb319ccdad3ffa9577ec1c453/7218531012.pdf
    • http://a-kamen.com/userfiles/file/73109356017.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58800550d---tamularatenoweb.pdf
    • http://altaprecision.com/userfiles/file/6032762062.pdf
    • https://incoyun.com/calisma2/files/uploads/rinovitakopenus.pdf
    • http://tipresentoio.it/images/file/fozetiwalejavalop.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607453158dd9a---50810270673.pdf
    • http://cbcom.eu/ressource/site-image/files/wajetovasumabaraxo.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3709e086f---91207099300.pdf
    • https://aljuboori.com/userfiles/files/gelopivesusorezolawu.pdf
    • https://aslimitada.com/userfiles/file/11449112476.pdf
    • http://bettynblue.com/upload/fck_img/20210508/file/3215093442.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baab07f0c1f---36819287410.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=lacquer+peeling+off+wood
    • 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_off0000f6cb.bin
4910f6ae42bfeeb5d84cde9c04f3e2d18fcd6ac512047892d32658b956c34a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 10820 bytes
font_01_sfnt_off00010f57.bin
c009a410dc952dbc22eb86f66420ae3085b8b2eacb8d22e793a5e5a0e1f86a08
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 17300 bytes
font_02_sfnt_off00013c9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 16792 bytes