Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c28fad667dad510…

MALICIOUS

PDF

73.4 KB Created: 2021-07-01 15:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 33d58bc62e57afd46b98309e40a9ca53 SHA-1: d7bd6643ea8b246dea8ff855c0df282e197ea17a SHA-256: 5c28fad667dad510961278c8ce11568383623a2efdc47a67a734126fd3dbaaa1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Phishing.Trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=embroidery+designs+pdf+free+download PDF link annotation
    • http://thedewakohchang.com/image/upload/File/olasonoviwupijetix.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ad778493---tujiwinopasesarelutekebuk.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608059b300174---kogujabenisolozun.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8341ciim5plrt4d0ahjtrldr40/rukarejepu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9a5b55855---fubisajakupu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/255f125da2b4e2e90933003cd6ddb186/12761061371.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/61428571696.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/0rmmhoe0jj67timoup22g2gbbf/gipekumogadexexobakife.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2cf59bee67fd7fc506cdfeb724ceba6c/25672003012.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160869fb648fdf---67003362560.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608def5ce8821---48386192169.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffbf6f1e3d---92385912960.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dikokewadiruvugegited.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/33386375795.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/64830259139.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/81568162033.pdfIn PDF document text
    • http://pronobile.de/catalog/file/20422313449.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d74083d40cd357e694ea04b74dd55e54/86845225036.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/fbg7aaunblv271bj5vctat3kj2/xurarironelilurewu.pdfIn PDF document text
    • 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_off0000b97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97D 16844 bytes
SHA-256: b0cf64e663c31a7aeb026a0b8e859c388e50bbf059fe50ab51ca6e00c0bc928d
font_01_sfnt_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 11064 bytes
SHA-256: 7dc973f40ccb6936846657a884994ea123583ada502d3770e8e1fa03c24cd227
font_02_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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