Malicious PDF — malware analysis report

Static analysis result for SHA-256 536cec14aad7180c…

MALICIOUS

PDF

116.2 KB Created: 2021-07-13 21:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3db3474f8d4b7cdd83e47e5456448d73 SHA-1: 159366e5c1c4f66b52ba928dd6309e5b1d4d3b7e SHA-256: 536cec14aad7180c30002cedd35014ec601bfbdd942343927cae22a93aefd018
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b9fa58baa---5765702261.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dc9d94d0f---siruretiwusiduditabog.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/e490ee78a420e6660e3236d134b741ac/tutikagegipelegorepewa.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/831314108861424f0d90d244129d396b/barelurodaxusuruta.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7001c81b48fa768aea2b99a3190cbbac/mikawet.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6327b55a65---38883998491.pdf
    • https://youkuvpn.com/upload/files/300664085.pdf
    • http://championshipsportsrings.com/clients/23492/File/42807818672.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8ea79d0ac4717cdd6c645cb01640aaca/41173266363.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5a7fda8d1---9361973200.pdf
    • http://polyalpan.hu/_user/file/letuzegigomufurikinolilu.pdf
    • http://www.peretprod.ro/content-images/file/27592130437.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd71666c6---18946930820.pdf
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/mutasabubaxebodefak.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/56548288981.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b07f19d904d57deb6fdecf40d27527af/24287709393.pdf
    • https://npkfertilizerproduction.com/d/files/69812257102.pdf
    • http://solamsys.com/userData/board/file/marew.pdf
    • http://zaun-produzent.de/userfiles/file/95066417046.pdf
    • http://vejwun.cz/images/25957739045.pdf
    • http://mim2010.ru/userfiles/file/12319404249.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1af0aa7814cba819b44fdde8a36e747c/nozipajuli.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/jegimiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gibbs+reflective+cycle+example+teaching
    • 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_off000162cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162CB 16792 bytes
font_01_sfnt_off00017ae2.bin
fc48c36f94a711c116008a8a4491cf6fb146c66e0293fcb3dd020c2f09262f83
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE2 11268 bytes
font_02_sfnt_off000194f9.bin
2b0f8c53b69d79b56a4be54b5dfd0096213dfa87feb625c99ec0f439a3472666
pdf-font-stream PDF embedded font (sfnt) at offset 0x194F9 17960 bytes