Malicious PDF — malware analysis report

Static analysis result for SHA-256 b103357df97b423b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 22:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92d567244ae3480a206c5fdef5747b6d SHA-1: 61c148c18b30d0eee6166b1b46265eacbfefbff8 SHA-256: b103357df97b423ba689132ecefd152797b7c5b8e90ce350253f6f7fd4378f16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics further supports the malicious intent of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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=race+io+mod+apk+download
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144a00b180d9---86044582326.pdf
    • http://4reality.cz/userfiles/files/14957523883.pdf
    • http://nandishoverseas.com/UserFiles/File/62054839507.pdf
    • http://almawred-sy.com/files/adminfiles/files/45653014783.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/79111580096.pdf
    • https://smartcrm.cloud/upload/files/40902307769.pdf
    • http://unitez.net/images/newtech/files/4786445268.pdf
    • http://hzzxtl.com/UploadFile/file/20210912184355381.pdf
    • https://glbtrader.com/userfiles/file/98784687685.pdf
    • http://videlec.be/ressource/file/gakabikezafabunigenuloj.pdf
    • http://cdkuys.handysociality.com/upload/files/mudikufefeko.pdf
    • http://ylgems.com/file_media/file_image/file/zikaz.pdf
    • https://jackinthegym.com/uploads/files/202109011836546908.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d992bc6f6c2dc3057273bc60216570c9/gugiwenajanu.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/wuparakijojeruxuxutadiz.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4gjk6nd01t1594n7f82vbdpnna/kuwan.pdf
    • https://membermimpi.com/contents/files/dovunapamonuxewuk.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/74494206771.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwarezofa.pdf
    • http://mebelhotel.ru/images/news/file/nukatip.pdf
    • http://shengyaweb.com/uploadfile/file/2021091902545724.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146c74a91416---55547540794.pdf
    • https://nonbodepsg.com/uploads/files/mojozenopegajafasibe.pdf
    • http://bijverhoeven.nl/uploads/files/jonepitikakuken.pdf
    • https://its-bulgaria.bg/files/file/gagizutop.pdf
    • http://hbaoge.com/upload/files/rogiga.pdf
    • http://przedszkolenisko.pl/userfiles/file/25178285838.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_off0000c2c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 16792 bytes
font_01_sfnt_off0000dadc.bin
5283b5740e6abf60b4abd2298f2af4e9019670aafa9dd0fa67608f5712c6493a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10532 bytes
font_02_sfnt_off0000f2d8.bin
9fa073d5a528228ddfb1b3d37ea040edb40c8959b125949854f3e91bf8904234
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 17604 bytes