Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7f7ad7013b0c0b…

MALICIOUS

PDF

75.3 KB Created: 2021-08-28 08:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2778d8b61c7f243addc08d4a576f0702 SHA-1: 4a315cfe8b4ad2a43dd70735a8c2aa38a4a1e805 SHA-256: ae7f7ad7013b0c0be33a49517ca6ec523e2e8eb556a9128f92c68ceb0559aa51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on potentially compromised WordPress sites and disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links suggest it is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0a6df9e8a08ad5e0b8e65df33b0dc3c3/96912157915.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160736a87ca1dc---2314802767.pdf
    • http://zetrade.cz/userfiles/file/66504502004.pdf
    • http://reklama-kemerovo.ru/files/files/18005727330.pdf
    • http://dui-antidote.com/images/userfiles/file/fijopuneduvej.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095db5fd0d75---wexuxubiguluvibexeka.pdf
    • http://korvet-sp.ru/userfiles/file/tixokoxezi.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5d3fa57401ba46bb289ee2c342a64a6d/vibaximidimeketilotuwir.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9a8bb673d9820f2007001229dd863cdf/sijum.pdf
    • https://strategieb2b.com/userfiles/file/vuden.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zarusatuzuke.pdf
    • https://livresdarts.com/ckfinder/userfiles/files/suvexufusokebaka.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/78981630367.pdf
    • http://protok.pro/upload/files/79498736998.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612361b0ad41d---24242389213.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8337b778---lipasubibadoju.pdf
    • http://softwarefactory.nl/images/file/guruvak.pdf
    • http://phantasos.org/userfiles/file/34642266409.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a21a9278c---67634783579.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5abb01131f832e327735b90df2b30e0d/dajesojobatana.pdf
    • http://rykatd.com/files/mulepepugufisuv.pdf
    • http://cl-metalparts.com/d/files/lawetenavofonodukep.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608741caabbda---76013210062.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160898a94a3b4a---punigarubaguju.pdf
    • https://unaizahic.com/Files/files/76024694842.pdf
    • http://kartywspomnien.pl/uploads/assets/file/51209002816.pdf
    • http://mingzhicc.com/userfiles/files/wakofug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=drawing+art+types
    • 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_off0000c63f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC63F 16792 bytes
font_01_sfnt_off0000de51.bin
c93b54ec5dce7940fd4d3ebc71c04e4eae6e1dabf9f175892c5d9401e26dcb5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 16000 bytes
font_02_sfnt_off00010759.bin
47d8143b2f94550b4608c6529ec8eac1088599f82ad66004c9c25f3535335729
pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 10464 bytes