Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f1f24b91126198…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 16:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79442542eb39357efbac4785339abf40 SHA-1: 2227d700e27d0d311cde06218cfd748837907af3 SHA-256: 55f1f24b911261982b0c9486a09113afed87846b0a6dd22eb08f812935807752
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites and utilize disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aftaplan.com/works/peepsparty/html/upload_files/file/92292390694.pdf
    • https://aawyx.com/sites/default/imageuser/file/vuxuguzit.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/311843c8334fb7760bd79a3774f58ab4/japamexumipiv.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607177f5819df---xufusetugakesi.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff22a3f74---21819685862.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rr55sn2i0tdnu4tj32tauqjel8/15888449506.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607158e70ba12---88876033480.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504104900388820.pdf
    • https://airflow-skateboards.com/upload/file/nogexalo.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a748d77f314---66703346181.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/p01h12g6o326supkjlig80rqu1/11768299980.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/544abc429f06a3a1fa5eb2ac60024f14/nexekupefutigadujavife.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160780d4b37098---76374523719.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb9ce6089---mixozajobidekogogugazutuk.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b8439ccf---61231548510.pdf
    • http://recrute.fr/files/files/gutanosemazupepubitifete.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6d9fd2c59---51075660139.pdf
    • https://festival.bg/fckeditorfiles/file/medukafonolazopa.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fb83c9dcb0452265448564f98c36f6fd/41577774364.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f36894cbb61b27e6fe0f5e35014e344a/2272137502.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3a9695fa---xajaxazawewejuzufaronun.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9bfdc4f3a23b586512f4018ac5c3b21b/rozikuduwoduwozujomovogir.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7fa5af53---3775605371.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=eln+cml+guidelines+2020
    • 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_off0000f06b.bin
0673478a6d04dfaf0ee1ea3d12fd408c85ff336d5b7a25b2670ce9c1c66d1ded
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 10556 bytes
font_01_sfnt_off0001083c.bin
3f6b86f8e51e8afc215dfa71fa7aa166cd4815445c9065aa39dec2a15f89c4a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 18108 bytes
font_02_sfnt_off000136f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F8 16792 bytes