Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95dc18d4b5c501f…

MALICIOUS

PDF

89.1 KB Created: 2021-09-19 18:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9986b84bb06685944396dc87812c1da SHA-1: 069b2935c6eaec33984932454a091fb99b03837c SHA-256: d95dc18d4b5c501fd85a0778443a784c2a67df523e314c1e87dc02fcb76b9138
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://securitydm.com/slicice/file/bemejurobuzojefuwu.pdf In PDF document text
    • http://kommunikator.nu/demo/userfiles/file///14908524230.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/dabapojep.pdfIn PDF document text
    • http://wdnederland.nl/file/fazowuluf.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/nipujokumebovoxas.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/xusoledogag.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6750981305.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/15893495172.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/renowuwakus.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/bodifoxar.pdfIn PDF document text
    • http://trivio.it/userfiles/files/lokupekopudoluses.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/90529025240.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/97483060641.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/sasirufimunofewedujaw.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210910_E74D40B21AF824B3.pdfIn PDF document text
    • http://hocomesun.com/upload/36036642287.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/7219625894.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/6d58abf00daaf48a049ebd3370f103df/81205286080.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/30a72502d3dfab7fab62ee68c06e2397/xekupedo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6d9a1a5a---85360956744.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/23174182336.pdfIn PDF document text
    • http://agmapure.com/upload/files/vodoxaguxukidozot.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8fc10855e7683bf2cc656458035e6547/deripik.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16146c12271ba7---xogovafibom.pdfIn PDF document text
    • https://tl-systems.hu/files/files/22403730909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=putlockers+movie+downloader+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 10984 bytes
SHA-256: 952959fa9db370f5536beecb8792589dc9482c50c81deeb9d5eeab2dfe246082
font_01_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 19128 bytes
SHA-256: ef4fd92e14cc5c7bf2dc0e29a18adae0cde06ce9f0f0d3d8ff2d6337a3613038
font_02_sfnt_off00013de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1