Malicious PDF — malware analysis report

Static analysis result for SHA-256 929fc20104dd15eb…

MALICIOUS

PDF

95.3 KB Created: 2021-09-17 11:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31bc2d39831006c38ff3cf340b811869 SHA-1: dfdbcaafb90df347c099c04138fb14589c4fef02 SHA-256: 929fc20104dd15eb2d76c212e0a03c1d46dc490ed1668b740f229a212774b1f3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://abwmountvernon.com/uploads/files/gureraledugati.pdf
    • http://generale-bureautique.fr/gdb/files/file/12000333622.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7bcdb21a---ketegoluso.pdf
    • http://lyzph.com/userfiles/file/Fl202109092327524953.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/61509814635.pdf
    • http://muszempilla.com/files/file/lalupogamemedem.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/lobivumawedu.pdf
    • http://suliaox.com/v15/Upload/file/20219161028119941.pdf
    • http://dotykbylinky.sk/_subory/subory/dogixodarokugamisi.pdf
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/53709300051.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ef18480630bf73855d988898136c3af0/nusaxeraredubutuber.pdf
    • http://whkmradio.com/userfiles/file/92203010331.pdf
    • https://sentinels.ro/userfiles/file/78418894122.pdf
    • http://touristclub.in/userfiles/file/37838044609.pdf
    • https://alarouba.com/ckfinder/userfiles/files/pogemaluzajoz.pdf
    • https://adproissy.emailingmanager.com/uploads/editor/file/kubofetabule.pdf
    • http://euromarkcreations.com/new/fck_img/file/ninenonunawadulosidem.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/towaba.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vudazigaminimepijaso.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/54778112828.pdf
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kovujolere.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6731ab0e3---fobimidino.pdf
    • http://goodlife88.com/uploads/files/21606888517.pdf
    • https://groupburuemas2.com/contents/files/56344848040.pdf
    • http://fratellilongoni.com/userfiles/files/rawixutubuxokugagitok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=comunicaci%C3%B3n+educativa+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_off00010b7e.bin
8abbdef943249078638e1af77bb458ffbe289bcd2154e70007197193a2e6a54c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 19316 bytes
font_01_sfnt_off00013d39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 16792 bytes
font_02_sfnt_off00015550.bin
8a67ec00ec997eef8f7e2f324840ed46cb292837b7faa358a6eb33384e0e01e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x15550 10800 bytes