Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde6f34a37c1fa89…

MALICIOUS

PDF

77.1 KB Created: 2021-09-26 03:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d47ce85eddc6ac44d37ff4d4fc95ad51 SHA-1: 79691de67258143aa9d09ff79ec110cb2cc43e58 SHA-256: dde6f34a37c1fa89f7124682271b63e263c923b79fe46030833ffcb304abb4cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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 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 https://ph2020.org/FCKeditor/file/xolilukonuxovizuxo.pdf
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/robaxanowilenel.pdf
    • https://kompaspt2.com/contents/files/44490415657.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/rexariniwiba.pdf
    • http://amy-tsai.com/images_express/userfiles/files/37642291724.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139daf0762e9---kiraxagiwibusasoviguju.pdf
    • https://internationallanguagenavigators.com/media/gogezula.pdf
    • https://halkum.rs/files/82412934249.pdf
    • http://traslochimontalto.it/userfiles/files/87440455194.pdf
    • http://www.css-jp.com/upfile/files/2021/09/18/jirezitasugogobirodizeg.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/tasijosabitofilofebaran.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f91976d12---38170611325.pdf
    • https://kaptenhoki.net/contents/files/xifavevaxilenalivebejofus.pdf
    • http://futsalcb.cz/picture/vtextu/file/51745011701.pdf
    • https://a2designbg.com/userfiles/file/82999933447.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/tofinimuj.pdf
    • http://aorganboys.handyfriendship.com/upload/files/danawisujibaxi.pdf
    • http://telekommarketing.com/firme_data/files/35440543331.pdf
    • http://tecniagua.es/uploads/ckfinder/files/31741494546.pdf
    • http://icmasistemas.com/userfiles/files/46638061644.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/xumavixaraduzuf.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/49677091454.pdf
    • http://mindatpeace.us/uploads/files/retogigavivupapub.pdf
    • http://naoshima-habitant.com/images/blog/file/surezasuruka.pdf
    • http://luchetti.it/userfiles/files/wafumodaxosewa.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161380d266aacc---49102187232.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=naruto+storm+4+download+apk+pc
    • 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_off0000c17b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC17B 16792 bytes
font_01_sfnt_off0000d992.bin
a2a1c92a4bd37b829b459ea85f894609d591685f794c54cbe31a87651b0634a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 10784 bytes
font_02_sfnt_off0000f293.bin
b1a1ddc9750158026a66caafc5a479436ecbffba4221b14830fb86abb29d2401
pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 19808 bytes