Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c139d4f8a9a41bd…

MALICIOUS

PDF

94.9 KB Created: 2021-06-27 22:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c96d0b1584f420eb2fda4ed8ef0553b4 SHA-1: 3716eb621af40d016fcb2fbcd5bc49c1a0151400 SHA-256: 4c139d4f8a9a41bd47d3a1c630b44c5bf1d8a343df7ddccfdc3b3cfb61af403c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a85f9a4cdf426d4aac7d4fe0022109c6/jizixivogagipesekubatixod.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6428c4d69bd0cfb6166075e27ee87742/zovex.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/5252108794.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160903db8ee95b---78091508123.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gabudegatozepaj.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/02c23ab850e4f04981bf1923c12cc857/rufurawi.pdf
    • http://energo-market.ru/sadm_files/54079498561.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/v2k3m1vg4o801belc8mhsa8pn3/ziroxofipojadujijod.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085507f7cb84---kibefefiruratafoselobar.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c4ba9621---sivixenubefununeles.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca571acf04---kuwilozafizetepenikanul.pdf
    • http://amphorabeautyclub.com/campannas/file/fedakelefasepipupu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aff468035db6fdf9151fe66b0370dec9/wovakitop.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/xuxek.pdf
    • http://accessiblevehicleservices.com/userfiles/file/letomiwipozexop.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qjurqov6c6huvl4tiidg34ue52/51977704031.pdf
    • https://tort-art.ru/userfiles/file/68927672336.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/clekb7lgke6n47dfplt29o3s66/148880154.pdf
    • http://flygarfield.net/userfiles/file/53260734266.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ba9a0cc7e10214a5f6f705871dcbb90a/88127695436.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210619_2C400B4F0399DB7C.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/795f9114eced1344a2c82a4f01ca3403/nigagonebe.pdf
    • https://arichaindia.com/userfiles/file/23268079151.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=conflict+interview+questions+and+answers+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_off00010dad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 16792 bytes
font_01_sfnt_off000125bf.bin
1d77d8b93a372d6054aa3f9109f28c4d4fda692e218a853e12a3aed2326124e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 17844 bytes
font_02_sfnt_off00015498.bin
be2c896ff47fa4847d8e553c7605ad6e9356e0c2f91379d2d3882248e91bb6f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15498 11044 bytes