Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1df948c06dc8165…

MALICIOUS

PDF

93.2 KB Created: 2021-06-26 10:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7a07282ce379954637c98f82ee30504 SHA-1: f9f8396a3c1dcf62452fd92aaec9799d9ffee12f SHA-256: f1df948c06dc816582a60053ee6198a34b2b05abdb52b8ed72a332a84b31f497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary goal appears to be directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609705ee2e833---sijapopiwijujoriwaxut.pdf
    • http://matstravel.ru/userfiles/file/zizipeseb.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5b8e9827b---gurevubereforexigedib.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945101b5fc3---xejokanawipofaxazudub.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f631cea3d---takaweke.pdf
    • https://flardochform.se/userfiles/file/67373817640.pdf
    • https://angkoronetour.com/userfiles/file/vavevunozasafepu.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d47d13a4f69e38ec0574e41d55d5a0c9/32725014325.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912071ae8d8---befopudesizi.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888d428e05d---7510745691.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/fewofabefelobepi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fe9327863e9ecc5f3833034e03cf60f8/xoragoredomaz.pdf
    • https://hanahana.vn/media/ftp/file/tidis.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda2c35d9a---11176677548.pdf
    • https://bazab.ru/ckfinder/userfiles/files/17050044820.pdf
    • https://amatnieks.com/pictures/image/81470273416.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa0494024---77237340582.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a3986ac7---rivoxubuxidod.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/61039bf594b14dbd743c49e5a8c5532b/fobatebotolig.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160931056cc039---nuvevuxanisasubabefogeti.pdf
    • http://hopkinshigh1988.com/clients/75739/File/tuxijupogosababaj.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a00f53483a775f763a9433332eff52de/25897676990.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5c7292d34ed1256e8b9e4ff7719d1223/70184345185.pdf
    • http://ipublicity.cz/data/file/279320573.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966918273e4---25723685542.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4d03b30a77e948257003ca2b01b5b6a1/ropabisad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=stress+strain+curve+for+malleable+material
    • 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_off000105fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 16792 bytes
font_01_sfnt_off00011e14.bin
5e56debb2ea53e8b9a1225ad99dac75fa7aef1b27398a4d932d6b76eb0f0360d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 10880 bytes
font_02_sfnt_off00013738.bin
f484ca16a468b99ed7634bacf2c6908e99222a005367af101344bff51dc3452f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 18336 bytes