Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e3f9d4518366cc…

MALICIOUS

PDF

89.0 KB Created: 2021-07-16 02:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9842128e35d19b54c4251482d908c83 SHA-1: cf5f9791548429a8bc227ef975d67e14ce2e32a7 SHA-256: 99e3f9d4518366cc2a3193f190ddeba09deba119cb8cc14f4486310e8ce699a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage. These links likely lead to further malicious content or phishing sites, aiming to trick users into downloading or interacting with harmful payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c4e409743---botojajivukoresos.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf49cd444---67445578998.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/m13clj5plkjq8gf3pojb7g5muh/belogugufapawuwi.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/93223100771.pdf
    • https://die-elke.de/cms/elke_page_files/file/26243545322.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160be6f8c73b6c---67228658529.pdf
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/jososodifekufumudugow.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c122776abf2---dumipazamubumezixopifo.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cl65rf4pnhha53am92d2vpasce/53636223641.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dd2ad8841f345b2011a9b7de762ae3b3/negipetu.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5fa589ee---49161038055.pdf
    • http://bbdecontra.com/userfiles/files/vekewodelulik.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/xadelapavifakus.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/67513527.pdf
    • http://alpha-th.com/userfiles/file/rijotujakage.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877831d4abe---45066191522.pdf
    • https://anakmeong.com/contents//files/47219458196.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086744d1a695---somiwipimavozamoga.pdf
    • http://files.ibiza-ferien.de/file/28341520267.pdf
    • http://fw-simple.com/uploads/files/zajazavisuzoxugad.pdf
    • http://rolmech-strzelno.pl/Upload/file/pivegosafabajimopox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=manual+transmission+problems+diagnosis
    • 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_off0000f8e6.bin
92cb847e06284fce308e07013a39c2a4b285177527d35d88aa13b8701146e15e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 17188 bytes
font_01_sfnt_off000125b1.bin
73e76d33a992a0bd86eee838d8e2ac538f84b265396f059b8b4437bcf5b06656
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 10968 bytes
font_02_sfnt_off00013ea7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA7 16792 bytes