Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcebe72b3c7e3dc3…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 06:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e3b4f450bf5137193da8cbba5da1ccb1 SHA-1: e8ba7ced3b7687cb61fcdffe779262fd6e196b73 SHA-256: dcebe72b3c7e3dc34867b873b6ffe874be1327fa3b88b7633445fa7e54ec35df
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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 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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed9c541ed3---jemijivinewujurobe.pdf In PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/58606780eeccf239dee0101fe1cd83eb/67449598092.pdfIn PDF document text
    • https://digireg.it/upload/xoripowasum.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06ec3901c0---xujixutoliwiwupixumabot.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rbhj7r46fkcgrn1q265grnmttd/tuwobuvufozipidoboxopazij.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/18352640772.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59979bf3d3---90688927201.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c17c7aa548b---15798321845.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0099b76e2a---85786106614.pdfIn PDF document text
    • https://arerp.kr/data/file///bedozefojunibetezopokuza.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qtsug83ijpg01uol5pn36a0t8g/noxalalevexutazemibenokaf.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd5d4c9ce---17977124696.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210703005833738.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e66b0b3036515df781d566ac87ed8b16/12544320189.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ad838a2d67d7602a6ed1e2d2e6a2b7ad/12200349515.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/tujefemijuvolugotiwavajer.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/27886001449.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/domimerunowonugizukiro.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7dl6h88r2qcikaijcd67v3531f/kirev.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/rutujov.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777712a72d7---81930058783.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/60037407893.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/mipixelugajomafem.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1obt0bvlkjdc47376l8ceaj32p/tofoxixu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a16b53d1---2308172367.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/kabowamozetijed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hack+of+free+fire+gamePDF 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_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10344 bytes
SHA-256: 28de184c5ffa042b76ae628d7b056d9547bdece9c4ac826ebe4ab3a5c1315e74
font_02_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 17316 bytes
SHA-256: a0b163696fd5354c7ce09a25402aec260cbb70fcbb50418326bdbdd8e585cff8