Malicious PDF — malware analysis report

Static analysis result for SHA-256 f958d0bdff14979c…

MALICIOUS

PDF

94.9 KB Created: 2021-08-09 05:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aad4a48f2cd5b10cbc124e4b3ee9455e SHA-1: 9f720a0e97b27d6636c147ff39cbc5b69bb8251f SHA-256: f958d0bdff14979cf924da5e3eb264c75175b2af3ef40af75340735ef6b48b9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These URLs are likely intended to lure users into clicking them, potentially leading to phishing pages or further malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=deflexiones+y+pendientes+en+vigas+formulas PDF link annotation
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8622242c61c2b5d2f17d43f57ef1a3fb/kunageputufebofifinatu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/marusopodosewo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a1b3fca8---75348415850.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d79e6d31fec97020f53ac41774202b51/71415757535.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/72e9852ab4afcf2d7fc61a20aaa593e3/fisimigakekabajov.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3812529d075c61c355ecd6d9f2dee912/6656811663.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aba1ece0f---mikomakenepomelirimejura.pdfIn PDF document text
    • http://besteva.com/upload/files/75360364857.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1629d6e7c778c9597886d01715001b6e/413133302.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/39337987344.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088543a13142---81254404860.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/62c91de0f61bc5049c1cb54275f4f7cb/wigafefanusopasaxemubabu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829f5286c4d---zufida.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/0a8b9d083bbb9467dd4c00b569893260/45057392577.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/73d936628e1a5e580248f7f796b123a6/lekarovozigup.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/83641842051.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e26bd969---82631145714.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/89756284929.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/najemotawu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086658d940e5---vewobenuzumulu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/584b82413bf0edfbbc324ce08f5c197c/jukoxip.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/delivobuzoxamilukiritet.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_006_off000119d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x119D8 21384 bytes
SHA-256: 0468a1418e8f16f8186d61193e08d150a1db2032e4744647a0da949b7d9c8d4b
font_00_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 1284 bytes
SHA-256: 3f2eb68e56e0cc9b24f861ad510cb196f24dbc520975aefba06cb0b93c7ac786
font_03_sfnt_off00015172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15172 11224 bytes
SHA-256: 11856d069e28a305d064dfb0d38f9f6f2b3a023a0d0cced02ad21b5b9abc25bf

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