Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccca98ddc2c8b2c0…

MALICIOUS

PDF

100.7 KB Created: 2021-09-07 16:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cfd8ba5c7399a1fc25b486ddb160bd2 SHA-1: 9ab5113a2ac5b192a4ec39fba47e5bfae98deebd SHA-256: ccca98ddc2c8b2c0a2e6fa356c2f5f34c591e1239b150f0cfd3a3c948bb80fd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=linear+programing+graphical+method+pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1700c26f0---24956107507.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb31fc8e70---pobivajobinovosaz.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/be5974076a901c023ad59aa6a9e20a3a/69828376472.pdf
    • http://sdv.sk/userfiles/articles/file/47663611500.pdf
    • http://geofer.eu/userfiles/files/wisedaxexuxevego.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6aa1vraduclem3f2epemqrtqj1/2640506877.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/65492907780.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/13815119246.pdf
    • https://wasael.com/userfiles/file/33465143191.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/86ca3afc7f7f77d77e428941e2463c90/42688569435.pdf
    • http://ohana1bbq.com/uploads/files/16230919665.pdf
    • http://assotechne.eu/userfiles/files/pegegoreli.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/7ef70ad0b7e76f14a0502e724401c195/merelom.pdf
    • http://bestbelly.org/content/files/files/52271339464.pdf
    • http://multi-accueil.fr/ressource/site-image/files/rafopotadigenerilefa.pdf
    • https://bobecoingatlan.com/uploads/editor/file/tavakenulotojojituju.pdf
    • http://slippersymposium.com/clients/875641/File/zumibaginewofuz.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/794675c5ee6e1c271b0431a085484ffd/87274263232.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/xotosufomeke.pdf
    • http://ladyvenus.it/userfiles/files/xuzagedoxukagelupe.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2kiagf93fccqsi9b3845o8di10/zumuxapulelufej.pdf
    • https://autotronics.vn/userfiles/file/sanufufafo.pdf
    • 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_off0001200f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 16792 bytes
font_01_sfnt_off00013821.bin
a73c0e0dfb006e2b2c0a7cbc09a32f835adf912b78b7fbd958210eabb40146b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 20004 bytes
font_02_sfnt_off00016c50.bin
4939dc3a53be51f6977d2e4a9cddd8ff5c39e940fa9b89e1aff4a585633f808b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C50 10856 bytes