Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b7fcbed44655dc…

MALICIOUS

PDF

91.7 KB Created: 2021-07-04 10:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0f42d997483fa381f5bc8372f3f6a7f SHA-1: 960c811a8c4c1209d60be0631d17d0ef99d4cab3 SHA-256: a7b7fcbed44655dc08427f51118980720049be47bb50a8ff81b8fa5d31ebb8e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/scph1m3jta2bc3u8rgi446lvt4/46119116862.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a3039af12b9---45326551344.pdf
    • http://willbramephotography.com/20306510093.pdf
    • https://kermiradiatoriai.lt/images/files/vuponogo.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927a0e6eb3---15726103452.pdf
    • http://younewstoday.com/task/userimages/file/22445144269.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1cabd6c02---33799474502.pdf
    • http://brainbond.ro/userfiles/file/zirofimenizodanixulirof.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b18bb8aa7e4---83459936288.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1e8ec7cd---jadiruvesawedupolowebixi.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/07e8bddf60499c80fb75af744e82be67/18928000553.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b41cb01c06244474b5c5d495f6da1634/melagepotelazobeluj.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/d5l4rl3usl20kkv16ase4raac5/famiwexewamame.pdf
    • https://paklya.su/design/img/upload/file/37284858146.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a01c1929bcd---fajoxis.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/81b8543a366010fb1b1f501582d875e7/22878426456.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8ognnjanls51fb2tj81v0jhn1a/pibelapokus.pdf
    • https://condominiovillage.com/userfiles/file/89120274071.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084982c295b6---35581106569.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16077794247dc5---5728057142.pdf
    • http://mobilesamara.com/img/files/file/14195638028.pdf
    • http://vorne-sitzen.eu/pcms/content/file/rozuxetosatepokovexasimag.pdf
    • http://czdashan.cn/uploadfile/file/2021062605374073499.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ebbf8b9---58191367154.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2728f6807d9115c385db5f6d63af511b/keburizis.pdf
    • https://curewelldiabetes.com/userfiles/file/22657534841.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=computer+hardware+and+networking+lab+manual+pdf
    • 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_off000102d4.bin
8fc2dc6ce6f4db7d21c95df9201c6163ecbe47fac9ebcdcec0bd125b0d959b7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 11224 bytes
font_01_sfnt_off00011c90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C90 16792 bytes
font_02_sfnt_off000134a2.bin
c84af4daa5566314cf6ebfd94dea266a43932ffe4f5f7f5f45d86f54743c4f52
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 17080 bytes