Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2646c04f76806b…

MALICIOUS

PDF

76.2 KB Created: 2021-08-14 01:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44ee639d1ae4b402079239322958f865 SHA-1: 62d739a90d6a5f8f5c79cfacfa67773c9fe89856 SHA-256: 9a2646c04f76806b3c0a90946f630bf9306f7479f945caca1eee25432387c9ea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://irlanc.ru/uplcv?utm_term=how+do+i+install+rlcraft
    • http://asokmontridental.com/userfiles/file/71721335094.pdf
    • http://werder-ritter.de/UserFiles/File/xivobojurifoximuluju.pdf
    • https://le27.fr/docs/file/ridodigojogiv.pdf
    • http://barsugo.com/ckfinder/userfiles/files/sojasabobejelizexe.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7a711223---20844099885.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a28c1d2858b5db4ae8a7b712c6e2d489/80648985970.pdf
    • https://www.andreivieru.com/ckfinder/userfiles/files/86827224837.pdf
    • https://agmatbaa.com/upload/files/baxeribasupi.pdf
    • http://articolo17.it/siti//usr/foto/files/10350782296.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/repugozevefexib.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43a1990c9---30021650183.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/bc8cc531480016a4a4fdba77de97c406/94902291060.pdf
    • http://temple.mo/userfiles/file/43324542318.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a4377b57---57937929001.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/7a71bdfe2f3a183e8238c12eadc9463e/88454485983.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039d9640a---jagefirexupu.pdf
    • http://archpiudue.com/userfiles/files/65173165168.pdf
    • http://goldstecq.com/userfiles/file/56666045801.pdf
    • http://ascensionchina.com/userfiles/file/39210673328.pdf
    • http://demirlermetal.com/resimler/files/mebegufumegivofupu.pdf
    • http://hotelgiottotorino.com/userfiles/files/44933563929.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160838213d1c4a---donipukapuzolifakit.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/t57bibn2b4it1u8ca4t7s92gun/sitadalapezisajeda.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_off0000c858.bin
005a9506c828aa66134759eeae4a3be24cfff6a6f33379fb7076b386274aa431
pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 16396 bytes
font_01_sfnt_off0000f219.bin
fdf8c3672e58472bddb625f4deb5800c21a9976914254375b4bd458f3fa259ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10412 bytes
font_02_sfnt_off000109cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 16792 bytes