Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d02a9653f7afc80…

MALICIOUS

PDF

84.8 KB Created: 2021-07-04 21:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25f16123fd37c306a85cf14cb8033c52 SHA-1: 21b275cad5a93bf5c926df5794ce69d5bdf89c83 SHA-256: 7d02a9653f7afc802a5fef43d51340d7160ae834fb53e861adb637e9ef52976f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://g-shocktou.com/user_file/file/1762518391.pdf
    • https://alihuata.com/userfiles/file/vulasabutivagagez.pdf
    • https://snqrsl.quebec/upload/editor/file/11818950238.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adff22815ee---sovujikemixizirinunuku.pdf
    • https://dejavuruse.com/userfiles/file/tusateximu.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608333f7b2844---32564880750.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t4ao52ku730j7v1vin5rjddvo3/41121371146.pdf
    • https://flyags.com/editorResources/file///16887880769.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a2ca8cacf---4334585202.pdf
    • https://ayurvedaemart.com/uploads/file/99879677492.pdf
    • https://agentcctv.com/userfiles/file/sarululobixibidupomabo.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607501b9c8b29---getolasagote.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/82979aae294ee7d5a06865eb45e2fbf8/lopuninumufivitoxipesol.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/toplh7k0cp52cp062li3mhimko/36114602827.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b788505cbd2---derexolivimefop.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd9631a47c---duzusejujikuwo.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/bejavikogixisonetowak.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a7a3dfff---64448143190.pdf
    • https://menu2uplus.com/images/file/vuxokofiwuneduzuxoxivug.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088b073d6216---74422512714.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=giffen+goods+are
    • 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_off0000e605.bin
c76adf23485de13a4a462231eb248310b8735a57e5995b9b626337aea79724c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 18176 bytes
font_01_sfnt_off000115a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 16792 bytes
font_02_sfnt_off00012dbb.bin
7c41c15d59cd3ed0b5d25e80c22e57d32b68c6108f0d9729e5e3479fce75801b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 10424 bytes