Malicious PDF — malware analysis report

Static analysis result for SHA-256 34774b35b3e9ee5b…

MALICIOUS

PDF

113.9 KB Created: 2021-07-04 04:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31de007a7f7be626440a6ace79bb6542 SHA-1: 9b6fedd187b63483f67dc29344eed58865df75a0 SHA-256: 34774b35b3e9ee5b5d17eea87b83fca87455a293a02174f5486e9532d31fb051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malicious content. The `wkhtmltopdf` authoring application and the presence of embedded links indicate a phishing lure, likely intended to trick users into believing they are accessing legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://krisoc.ru/uplcv?utm_term=funny+love+contract+sample
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a6e7c90de737d2374e75dab0d353b0e4/25173056470.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ef1ade178---3099716516.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/bab767f2ee5dda739b62edf0fb03a604/12046467090.pdf
    • http://szolnokepul.hu/userfiles/file/12935918001.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ds6p53brlv9i10kv2h12d63jt4/lolilupedosa.pdf
    • http://fine-cottage.ru/userfiles/files/rijoxonijudasixutur.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/wufuro.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/fd93269c1fbe2898e3ead159591a1bb8/sokeji.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd42587c39---dorarixad.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f734c1b19---86302083987.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3b5eaf0963472a574a523abde430ebc5/tegikibaxebij.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b54faa157---ruroxinumo.pdf
    • https://veterinarycarefoundation.org/userfiles/file/zewanojudaduxajotuwebap.pdf
    • http://urduhadith.org/survey/userfiles/files/jadanuwiwororivamakimeguk.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a471887ff20---8387191781.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae2acd670---34882601804.pdf
    • http://www.jindatunnel.com/up_files/file/52648336985.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607868be5ae10---fitokepuvur.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98230d4af---66865595512.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f0db1db3c89a2d7c3659f2899ecf0520/23968911690.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087180d069ec---vadutiwinewuzizutofegim.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090afb84f58d---29145479389.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4786cdac4---komujomoxil.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb41f850e1---xolopokazamukoxupuzum.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/053fe1f57858f1c590161229584d1b75/tigufegalupexe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000182f4.bin
b38cf30cba7070f3ca54d9f90a2380599d4d9a43a3d8b1d251ffc125a24f7125		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x182F4 18296 bytes
font_00_sfnt_off0001319f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1319F 16792 bytes
font_01_sfnt_off000149b1.bin
773750cc66875f799ce94c2a9145f3ab3b2a6e42e1155587933b5a203f4ad67f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149B1 21924 bytes
font_03_sfnt_off00019f56.bin
e0b1feb3babc1fe53f64743536c2779575c1b8f14f01ad0b2165dd49f4cac898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F56 10700 bytes

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