Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a77a5e302d5132…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 08:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 934c09cc64e60c4a2d0d6ab8257cbfc5 SHA-1: c9ab9ba21aff2b219a9869c33d4ec22220f5b81c SHA-256: 26a77a5e302d513219964649046c808caedc87a0943c4727de7437af84ed95a2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs, such as http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160818bf4a5e1c---xavazugotomenawikozalis.pdf, are likely intended to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607239e1ee32a---8438283853.pdf In PDF document text
    • http://voxel-avocats.fr/uploads/file/goxipekufup.pdfIn PDF document text
    • http://akapacha.com/userfiles/file/dawufonezibuvime.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/523af7618581afceee277ce561c3a137/lurudodalorokiresexi.pdfIn PDF document text
    • http://debden.org/userfiles/file/kajusogoteromafo.pdfIn PDF document text
    • https://argumentua.com/i/file/53423707018.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/61tmno6qenssgp6jn90orgf686/94945125305.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/zixopogaropulolire.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8gr1n4pcut8jbbtoat7u9tcum2/75201182124.pdfIn PDF document text
    • https://haidangpc.com/contents/files/defixaxa.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/nololamoxagiramadebiju.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9fae4ha08coc5tgrhg4fkft0s5/30662784147.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/854dff633cb40c599d300c1bbda4a6f3/21583457277.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160818bf4a5e1c---xavazugotomenawikozalis.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/630f205a10e86acb0b08080d5d6c7c28/sukigowezarowaboponi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/trvqv2jqkfvd8f1so4l67viijj/fodozuvedogitinejuru.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/33080604126.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16085134910382---vabukafo.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/31283650071.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce9514652c---16230488376.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074adbe5d960---50756342086.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/19aa7bafac78c080edf5719dabb21566/37664417141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=open+private+account+photos+instagramPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 17776 bytes
SHA-256: 57d813e7f98dbc7d961a82de15242fe4ada17da0e834deec0026e8f82b08a486
font_01_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 10968 bytes
SHA-256: e7754f54d495aa285cb7598e0ce4f0841a076fc741b7d43c83284e6abd9cbb4f
font_02_sfnt_off000132ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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