Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a88e4c578e4f58…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 11:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fff3f762014def03817badacb03d61bb SHA-1: b26449b829b2627889c5d555a160df359f1ed16a SHA-256: 89a88e4c578e4f58401eb421ab4d369ee0a1974bf857553a40de592664eeeb06
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe6c0c09ae31e855fd6afa1d04ace6a3/60381110021.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/28393c15ccbfc39d7ff37d2e9dd04d08/78755520145.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e07dc4a949586c5980d70edbb77ac284/89097933975.pdf
    • http://stark-tools.ru/images/uploaded/rojufapozavi.pdf
    • http://rencontres-icare.org/userfiles/file/febozotewiw.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/vemupuvusila.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97476cb02f---29159987358.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6g7nlv6ioe8j01n84k3ra6m925/88928278278.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160737c389b46a---30956724517.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d07bfaa4dbb---ravasevegeg.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0d12b7eee6fbb09e85edda6065060b89/69282837714.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/557d849b3e522733a8750c63617f3d9c/zatebejivinusebiguboz.pdf
    • http://sun-eko.eu/files/file/bixufenemeku.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/e4f3aq3dkguj19h65oskrrur73/bidevarinik.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/66be53651b888824cb877e1d82b5c735/rurifosidazizopim.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e454d032a3b5c59491f662432a061ea7/24119608176.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d7a9f4381f51389b9a8f54f59d3095ba/26785109435.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/18d2ed47d4aeaa348920dcc4bcb87e85/73391705373.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/sinakixapod.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cc1a3a90d229cebf4cfd92f8a6f7d8ea/xukonuxuvedewemare.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a07bc171---xuneduxetotubuxegutojebos.pdf
    • http://sportgalaktik.sk/userfiles/file/23721070110.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dp2h5fmnrcsvl9v1imnq2aq574/jekewolojunovivapuburulo.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb29ef9bb---5175236996.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2+weakness+for+interview
    • 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_off0000eb88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 16792 bytes
font_01_sfnt_off0001039a.bin
887dd9658dea44af5a680038ba4893b0b89f7d65208101cb8b955999969b1df7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 17712 bytes
font_02_sfnt_off00013164.bin
f0b1e1036e56b13eff1d91bd401c2dc941f247a2c2d657d7bb58b5a4875858c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 10428 bytes