Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bd6b788cb6d552…

MALICIOUS

PDF

91.8 KB Created: 2021-08-17 21:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2022e4aaf9fdf49f607ae9a108807492 SHA-1: a303417fdf449b402ff433dcd17b18647a3aaa08 SHA-256: 76bd6b788cb6d55287b8b40e00659b75a3b94e55a53c8595a1821fae50a2eedb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's purpose is to instruct users to download a password-protected archive, a common tactic to bypass security scanning. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=fundamentals+of+heat+and+mass+transfer+7th+edition+solution+manual PDF link annotation
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/9f6cd45ab6dc7d52a10f2b8d5a6e51ba/luzux.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/9281a487b387f846a5f15b6c5663260a/83726009610.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/mekexu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/00fd58f7a23049baa0baa8c80bf84abc/mubej.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/pozofevaxuzosotujojuwo.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/temij.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f936c8f77a---73522565361.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609480605f132---ledefiworiraradomoridilil.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e4e958caa83e351815793d85e548caf2/zewapak.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/fibakimeredinu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xelagivawuruf.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-20/20210620230006597642.pdfIn PDF document text
    • http://www.heksan.com.pl/file/70522746665.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210722_015740.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1ckaf2b0vam50o1qkjl5h6el74/zorarulupusokes.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/43981195981.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/21699176009.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c576599d373---digilizebidubujolarij.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/muvomabugovolepifabete.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd05bc8b089---95826912072.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/22954115948.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e0da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE0DA 20672 bytes
SHA-256: 151fe55251e190cbbdb1a34aed1a1707063edacad1216b8d1f182f973be73f7c
font_01_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 16236 bytes
SHA-256: 4ec4c41c886e726fa46da1152441d2305b995b1e84d53fba0218cc90d2c99a15
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F1 10748 bytes
SHA-256: 3eac7d2a25bacdd85ae4eb105fcbcf844530f3f6096f80093400aff1a2f4a851

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