Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b33f8d869ac405…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 19:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c21fd5bfa6be33c30584a707489acc4b SHA-1: a56f16ed1974e509fc5b27174f0d702a544c0d56 SHA-256: 32b33f8d869ac4056d2203a06eb2c378209aec65da522a5a8a5035ad4167ecb3
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites hosting other PDFs. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e415f0871c---994138072.pdf In PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/80660286149.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc49296f8---29295694364.pdfIn PDF document text
    • http://pronobile.de/catalog/file/biragasexotananol.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a385ed39c48---lufigevopirani.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/82082475122.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160799bac779c1---jorobomok.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acf44b34977---wupekadurovunojogiro.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/84190499060.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe82269f80---divajirikepedazegu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/16744768390.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081467f1394a---85658736750.pdfIn PDF document text
    • https://majubesar.info/contents//files/tonofevam.pdfIn PDF document text
    • http://licausi.it/userfiles/files/44349374981.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/rupopegilam.pdfIn PDF document text
    • http://wych123.com/upload/files/85003495380.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da12d362b7e---76485703623.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/gusibarivavusodasusakalov.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/vupiwu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611bba6d87de4---gezutogi.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901152646.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/tanugunezatatezete.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab87bdd8d5---tezuvajo.pdfIn PDF document text
    • http://asfalon.com/__files/file/nixufebepisakabagup.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f8d69b2ea0956cb9ad589c92bb33a316/21464792024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lennox+thermostat+manual+51m34PDF link annotation
    • 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_005_off000101ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x101AD 16888 bytes
SHA-256: 65ec3de44c6767b8e65203987ef3fdcb051680f0a6e754af9a448a5e13c569ec
font_00_sfnt_off0000befe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 17144 bytes
SHA-256: b3b45575b6af4ceacae1e6b7294c25190b239816741abca3ef65cca390b0be91
font_03_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 10876 bytes
SHA-256: 80dcd3a62203b747c21b40ba2ef99d7814c04046df67b7a1820d43fc137e9dfc

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