Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbb056b902da4ac…

MALICIOUS

PDF

93.9 KB Created: 2021-06-27 08:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 093858c2cf4f19395f4e75b5af037067 SHA-1: 999a889f6b9a236dd5117730b472932b045d6222 SHA-256: adbb056b902da4ac34c27c7e4ecefa8e5bc093ea719794bbcf6e617a212bf68d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or scam attempt. The embedded URLs and link farm heuristics indicate an effort to redirect users to potentially harmful content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607567b771e5b---wobak.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db35e516b9---zifujeledixakagud.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb408bebb7---94917245118.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5ccc1bd6c4c48d8f6dad7b8e328acb75/toferat.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853bbca8478---74114323927.pdf
    • http://ccswcd.com/userfiles/file/12672216973.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210515/file/16210421977651.pdf
    • http://systemsbiology.at/uploads/assets/file/24691456344.pdf
    • https://asset-books.com/userfiles/file/94732123439.pdf
    • https://mosallaesf.ir/uploads/ck/files/gepazawipozanaxexab.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/32c3a2f14c29689fcd28bc525c0ee83e/vapimebanipevalipunekos.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da96ed4e18---36581060196.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b7c31ce02199d1fc109829df935fd052/timetuninigitatom.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/67558512976.pdf
    • http://austral-immo.com/userfiles/files/20890865718.pdf
    • http://amandatravel.com/userfiles/file/javefijizinatigasedajer.pdf
    • https://semineebrasov.ro/printuri-fi/files/mififudorufeledumutodudet.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d47dc7e04---75502237723.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434dac2780---jugororofexamepowo.pdf
    • https://saatyapi.com/upload/ckfinder/files/28097754515.pdf
    • http://elitaliaweb.it/upload/file/ledofiw.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d93801117a430871823d9ff38d585bdd/51469937312.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ce5659ffb9492be381d229a9e9ad778e/1136555971.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/92838efc1051f4d04c756fb822eaa996/pijevixilekexabagen.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a415f9b0b4d---48183434549.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb7bbd0f2---daleviziwezafepemarifono.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=thesis+for+computer+science+students
    • 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_off000109ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 16792 bytes
font_01_sfnt_off000121bf.bin
1456553b579eda7119e41349da1c4409f23f0d00b9e4290d8ce7ef340f7310f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 18308 bytes
font_02_sfnt_off0001517b.bin
77913a2ddbeda8d28adfad2a1119c7679e742aab77751220df72f44fb814315a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1517B 10740 bytes