Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f1942028173192…

MALICIOUS

PDF

85.3 KB Created: 2021-08-17 10:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 143476f4cc548b1273b45a9ed14616e1 SHA-1: e80c68abc52402bb19139380ce872410302b1285 SHA-256: 99f19420281731928886e46f5333e5e24abdfcd7cd2954cf7f21ac534189b923
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for distributing phishing lures or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of multiple external URIs and link farm heuristics confirms the attack pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://archism.ru/uplcv?utm_term=microsoft+acpi-compliant+system+driver
    • http://bangladeshceramicsociety.com/uploads/editor/files/tolumakutirusu.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6efd9088f89502f8093661a2cebcdfa2/rileker.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf439d4bc3---97013998191.pdf
    • https://pima-alarms.rs/slicice/file/nobetexijarunuxogumax.pdf
    • http://tiendanatacion.com/noticias/files/wanidazejojibiseges.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab802bf9eb---4053079862.pdf
    • http://marmaraisg.com/images_upload/files/71251851512.pdf
    • https://lemanssrl.it/file/xegokewijidenegoga.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9563280a45430ca17bef4a756b76460f/48916757661.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8da2c4a3---kubiseledirixazoxex.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a225705e202---fuzixoluwolez.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/sepiwaj.pdf
    • http://berbun.com/user_img/file/wusozoguketevokevolor.pdf
    • http://szhlfz.net/upload/nakomevisokixiwowimipev.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf97612bd2---fewutizebarunoturene.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/61a362dc412f869ee154afeff816590e/vimewufuv.pdf
    • https://isleo.com/i_photos/file/delefudilisuburavapesomit.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607afdee6243d---xinukatu.pdf
    • http://archimax.ch/dynamic-images/cms/file/72874889988.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609429819b2cc---togegodemaxarobade.pdf
    • https://aydin-elektrik.com/resimler/files/95029666775.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f6fb7cc1bb69637ced1fb6e40a4f21b4/53704431266.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7b9e67ac2---nelaxusanateb.pdf
    • http://wingmanresearch.com/userfiles/files/bipelimis.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_off0000e764.bin
7d9a7a9981627e8a6c38dc02f1f97917cd380e02a3c5529759a4affd90f8a9c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 10988 bytes
font_01_sfnt_off000100fb.bin
b34bed1beeeb4d293de9d0f1f2248f93de8271788ab836e7ffca0006d73270f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 17676 bytes
font_02_sfnt_off00012ec5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 16792 bytes