Malicious PDF — malware analysis report

Static analysis result for SHA-256 2658a98fab26f1b5…

MALICIOUS

PDF

76.9 KB Created: 2021-05-08 20:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1dffce3032ca9f0dd4157495f60119 SHA-1: 0d202061f183776a72f37e2da7acf353324cd962 SHA-256: 2658a98fab26f1b5dd975edd26b17afa4323f43a895ffbbd336be769daebb7dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081559d65e3f---28966365209.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4d75eff9dfb218722ff00a80c6e1abad/78604012329.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ce239186---86717562773.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/mkii5o1cq7m871qds3e00jlqf6/25223066328.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/73bc4f1dabdd15977709ea1d71bd9a88/1216047118.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f9d1937b---retotagujedexipafipeb.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24f45752b---28943359491.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6bdd02524---memolonop.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kfgfsbm0vjt2kvvaakcairpcnr/64977095102.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vac93h5je1f47tfoqsjdpvg3tp/pomuwisubogidebibiru.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de53631c4e03a71037b6bdcf49868977/fedekefepiwu.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160857e3fb922a---5674378057.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2b366815---buxexinozekesetakejigox.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ab07cf88---76466350592.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8960bd00---12333805444.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3deaae844eb113c258d915704565b355/misedul.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160875abccd07e---lofuganaregilisobenasika.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1v2ohvbfr27cu34uqgophhf87b/pezejededunov.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c0142457---nojaxisaxanimimulugox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=indesign+program+booklet+template
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bf.bin
cfc093574e3178753abc150b9b886b84b6531bc02c65a30e6a25ab3c658af6f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 5420 bytes
font_01_sfnt_off00010312.bin
61362384318cc8b4e07026caabc18bbfa3cfd9cf93b8b478fb877cc1628bbc43
pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 10388 bytes