Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8762f8269bf72f…

MALICIOUS

PDF

82.2 KB Created: 2021-08-31 23:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3902f15176bdb99af2bae3c11907b171 SHA-1: b756bbdead2c7cf305881b5366743c4c24b497b5 SHA-256: 3f8762f8269bf72f91123ee364ae56bf27db2a880be82eddf04f2666187f167d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS upload storage. Multiple URLs extracted from the document lead to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://alarcon-v.com/editor_upload_image/file/lukeginafuzexukutune.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f4927d63834cb1f9950ad53366d123bb/xawimumivazezerej.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609100bc523e1---86084164985.pdfIn PDF document text
    • http://dogable.de/userfiles/file/putumegonobugumama.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078402d11cb5---89793370425.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/puvaxigagam.pdfIn PDF document text
    • https://premium-house.uz/images/file/pijirivosonotasugogonix.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087748edbbde---dugexizadititepuk.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/40709c00368b9f34f4c83ff02aefef1f/26240854802.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/digopumat.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3d038fc9---ferafakemunetofapem.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96311352e9---20584515147.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/6632044945.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/fivexememilegusi.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/92978398803.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/vafesep.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c45617bdc32---11734026069.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/93196041089.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/71qmrse2l0cqlm9ijc1b3m5vd7/83146186553.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a422c43990---wexobalazotinaleg.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2696151da---zewajasuwolowarevilebusaz.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/40828670927.pdfIn PDF document text
    • https://novsport.com/content/File/fokifur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=although+though+even+thoughPDF 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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 18096 bytes
SHA-256: 71889012c3ecc2dd2754f22ff67f4aad4f9c4ff782f4e4c8df453bc261573d36
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 10012 bytes
SHA-256: ae680a251834d8152b246e2c4cecd7b1c6a2bde1db7c63652dcb78f63260e539