Malicious PDF — malware analysis report

Static analysis result for SHA-256 7958de0c0019cd3c…

MALICIOUS

PDF

86.3 KB Created: 2021-08-08 23:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7117a40adca27bf81d0806d7229dd83 SHA-1: bedbd419c38f269abdb17553790e127f6d88a34f SHA-256: 7958de0c0019cd3c3452d4adab305603565d14014f82b241965c80259332d9aa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and disposable domains, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=2010+toyota+yaris+stereo+wiring+diagram
    • http://sattamatkapatti.com/userfiles/file/zijojugoguvukofax.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e67c303f6---nabitabizidixefufit.pdf
    • http://drivingschool-brno.eu/files/50503819788.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/dupivaxupowurolerijixi.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/14812485486.pdf
    • http://lamorenj.com/userfiles/files/warubujevorozazi.pdf
    • http://brilspa.ro/userfiles/file///43098180885.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9f98832faf9d7ad643be26672d347844/gezozefeparawos.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e2b7d6f6f241982603c5963300e36fb7/vekoganoworugerozox.pdf
    • https://uniqrelation.com/userfiles/file/guvofidudumofaw.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb58dab743---77857492605.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/75160970281.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081463890520---wotoradanugew.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/24591115468.pdf
    • https://vresponse.net/userfiles/file/difatoboxenite.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/52a2ca553a8b80697a0a934d8145a35c/tegelotazodafapuki.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/titirabedejor.pdf
    • http://maisondequartierdespareuses.com/userfiles/file/mudaxadof.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7f3161ca0f454c7a3aa851f898cb225f/dokatitaji.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/pujofisewivekojux.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534e5547d9---zonobuxupoxopomubiz.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f26978ab7d75ef37dc15110a6b8f7331/runikaxales.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8af29045---powubixi.pdf
    • https://udruga-invalida.hr/files/vibozedorofigesufebamaju.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/sejezujexojilajemug.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_off0000edc5.bin
73a828d0bf217e48787af0b65c5a94bb127539a64c887c6dd69571c310d75767
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10944 bytes
font_01_sfnt_off0001071b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 16792 bytes
font_02_sfnt_off00011f2d.bin
fd54212d95accab3449cdd2359bfb5c48817bb08e7ac19662fdf35d414ad44a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16892 bytes