Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efb9a8b39a0241c…

MALICIOUS

PDF

89.5 KB Created: 2021-07-31 23:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9803216330f410501b57f929deeba44 SHA-1: ff489bf2ebfd522aa705af972e00576cb442e1b2 SHA-256: 1efb9a8b39a0241c0b3ac929e046321a768e0147d0dfeda9f52f75d015202b86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9135e768c---komuzepabiwu.pdf
    • https://elnativocoffee.com/silver/upload/files/fazodasaxifesex.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b5273816a4df0ce5a037c7aef0e18d03/rosukamurapo.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a94250d0edb---wupogekiduku.pdf
    • http://gtshotel.it/images/file/2845033846.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608730494cd8c---rakonapa.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06ab0660e0---zajuravaxixurisukepapev.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9ak7m1d0758n940omn6ibdd4s2/83340851252.pdf
    • http://www.toptehnik.si/images/92304785595.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9a3b4de09858409615fa698bfa26caed/47335404993.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/796c3476306b4c0e8db13777339f92a7/nirewitukaluwemivaluk.pdf
    • http://tubietelbar.hu/uploadfile/80020902245.pdf
    • http://samnakthodrahassob.com/userfiles/file/13210791230.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeac2835cb---50996358889.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161033f1a6c84c---2520233955.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e148e2fc---82941089618.pdf
    • http://meble-tk.pl/userfiles/file/bokedipaxekabefive.pdf
    • https://addsfly.com/userfiles/file/6214327502.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/805a3b4de995fcc47db9495a3919ef0b/18544503734.pdf
    • http://marinapogon.pl/upload/file/vimevenapevirufusazuwom.pdf
    • http://stlnsk.ru/uploads/file/73841922674.pdf
    • http://bensonlandscape.com/editorData/file/67307549796.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/sudisegezejozanomemorij.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c314fbe1e8---sijokiriva.pdf
    • https://luminex.pl/upload/file/59228210661.pdf
    • http://gloucesterclassof81.com/clients/23558/File/683097041.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=acc%2Faha+blood+pressure+guidelines
    • 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_off0000f974.bin
97e054dac5d67a25e6393242b067c2a7e8be638b6bc9a922a1e19e9fd6e2819c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10948 bytes
font_01_sfnt_off00011260.bin
e7ccc66c0f0b05d266013036a8cd5d5a969d63570ec8faeabf4bcb3504a013ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 17208 bytes
font_02_sfnt_off00013faf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAF 16792 bytes