Malicious PDF — malware analysis report

Static analysis result for SHA-256 448fd886098446f6…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 00:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 29234a4790606c9c5c7f447cd9ee21e0 SHA-1: 45b2caf0270e7320c279cd81787f1fdf14c65649 SHA-256: 448fd886098446f6ee9596cd5f0ec2a0e1d8447cafc950e24b840b83db8a546f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://bebelino.ru/userfiles/file/zukukeputipeba.pdf In PDF document text
    • https://techlan.pl/files/file/dibusuwupoxajovedumi.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/97580902430.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/49453891248.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/xixekufa.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076da761a4b4---sedilujeloruxufixok.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609280100a412---50584132739.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9ac0d7b59---dizefe.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/67787602694.pdfIn PDF document text
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/sezafexifoxus.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/muwinowegubafawakujulujoz.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/dosagibelozuko.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/1587721722.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e49bb85822---sorifikagakasazirevadumu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/eoobfn891gl29uoqo815o27uv5/rilibaxuruwineveriruli.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c7c5b6749---wiwabotu.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/50895279987.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/81462091447.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/megapegopatodewig.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1f16094f---fokavofemu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769cbca2d67---11158254536.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/fazoju.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611556121f8e7---vovegewalador.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/nanipajelozubaxowoju.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9b9fde18b1f5cedbe3112157ce8f7ef1/jumibonetakafuxepiru.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c60e8255dd2fad5aff6f4e3bec86a7c5/xizufow.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ilferu37h5fgc3nhjlcrpv3o9m/77064844916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=laura+brehm+end+of+timePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C5 10604 bytes
SHA-256: ca40794889e43456d5ce8f0ec529863fc74d9ac40176f47271f57dcffb8b4fbe
font_01_sfnt_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 18456 bytes
SHA-256: e0420969c7a85e966eed080ee53696029e7daed8004554e5a261373b7cd0c675
font_02_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1