Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844e8b2a8344c69…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 02:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cdf006d3e4b60a26f5d82da365b36de SHA-1: 76f7f9400d44e5bbe45afd2681ca6e4df8492418 SHA-256: b844e8b2a8344c699faa65701f6393c1ada49c179e6971b6d43db7c1109aa99f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs are designed to lure users to these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609406cf700ee---66665219443.pdf
    • http://weingut-suppan.at/files/23224869839.pdf
    • http://juha.be/_files/file/laxan.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/91202732470.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210823_00E3959E3714D38F.pdf
    • http://megatex-plast.ru/pub/file/fubutopijuvarefoz.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a3532615---kibibojetezaribogas.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/lopilodunurepokupujipabul.pdf
    • http://status-go.net/gfx/userfiles/files/rujetitodo.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/zutad.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/mipapevizajukepomorow.pdf
    • http://iweldbot.com/ckfinder/pho/files/80828259621.pdf
    • http://gorisum.net/fckeditor/upload_file/file/zojiwaguzivak.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb47a309495---sijijigupedovuxef.pdf
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/84383951272.pdf
    • https://mrdak.cc/uploadfile/files/namizixuvazo.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/terekubilatamoxoko.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/fe2ea3a1d5ddf0140d563bc8e189a65f/kaxorawawaluleviwiwuz.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a942ed346b2---pobedibifemofuwi.pdf
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/64826739267.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/72021061342.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8ffe80f0d28f7cc0a4dc063b1d2fdade/xebonifexukab.pdf
    • http://turar-mussin.com/userfiles/File/79111392297.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/dce1c5615dd8daf22b5a21e938165d1b/tuwurajeguxazitakenixuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=days+of+the+week+in+portuguese
    • 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_off0000d709.bin
cb000fd00a0591e0b49216abe60f06184b5521b4295bc6d024e689ee63a5c48d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 17400 bytes
font_01_sfnt_off0001038c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 16792 bytes
font_02_sfnt_off00011ba3.bin
a689c8877e2fa50d9dd2a5c74d2f477800097daa62e0d0051d4faa05a4fe766f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 10984 bytes