Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5ffa15422afa6b…

MALICIOUS

PDF

84.3 KB Created: 2021-07-08 14:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b4a2afc3066444e74101f19eb84d4a8 SHA-1: 6c41d835f1c9ecedb40aea2490996ea13a910533 SHA-256: be5ffa15422afa6bd84e3f767b9f5e731ccff4e9f86f99d0dc4941f93eed0751
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting upload directories. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9ms74ka145d2sq3u9a7c9he2m0/xemojugubufarizisudofepeg.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160896489b66d3---tenewatemu.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b9f85db8---38952353653.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d80be02ef---fiwef.pdf
    • http://brainbond.ro/userfiles/file/74163518605.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076af406bcdc---67167632649.pdf
    • http://kennycojewelry.com/userfiles/files/202106/1624990481.pdf
    • http://etkindenetim.com/resimler/files/47886186880.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/1737fdd62c1a0f89d3ea63cd6e6da504/xesivisuwilasevula.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f53fd2a7953a69742162cbf125ce73aa/sofomona.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210620_2B21BE0D135A333F.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e9dc193886fb411433bd7b08698453eb/14328051426.pdf
    • https://northcoteplaza.com/userfiles/file/9440951966.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a77373742---kedulexizotuxusoputofu.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608267de90de0---62984094529.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/vulobevupuwubafaviwok.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/c09mda8dp6mpe8qbsj2k9k67u3/21936007795.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/15821348127.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d7694d4d1aa---95637760815.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/82897a5eusbofc7bggg1gd8di0/50284451517.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609036b03b714---bawakabasa.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/1ftgbq18rg9ake1f5ntgd5djt2/75347784527.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d01a5839---fabavunakazedigubuk.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/g1tqvrqet6s5qqdog6sn07bdu1/lilamogi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=narcissism+refers+to+feeling
    • 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_off0000e983.bin
a4708b6f06536cae9f28a067d4c20477eacea2301dbc6f9f5de9d603526ac994
pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 10656 bytes
font_01_sfnt_off000101ec.bin
2b72d7994cbcc49787bf6fb46b5f2f870b1691ed38dbf30db3f6ca579ba79206
pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16168 bytes
font_02_sfnt_off00012bcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 16792 bytes