Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b7373be1f0b15a…

MALICIOUS

PDF

85.0 KB Created: 2021-06-10 11:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9abe5840072e21f7d2a8f3576e825fa4 SHA-1: 6589881a2da7790b112931d65de962837f0288e1 SHA-256: 83b7373be1f0b15a392dc48fca13766cb62677c3b69df9baca52861216be13a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware downloads. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://inwebjor.ru/uplcv?utm_term=multiplying+and+dividing+integers+word+problems PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/je9tva502mfq6k3ie4vaigtk0e/fokewududonaf.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fb25e7b4b673caf88cae00f9508af607/boxobigavoxetaxifew.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b3acf328---sagetiwusujujup.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f4609823---73790092575.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7jqins57crlu9n33uda8qja5n1/renukorawividuzanodobimem.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/16fb49a31f32415add471398e7d0f744/48395458614.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/03b46232d258052f08338743d9e62579/fojirelikezobug.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/lipasufizixiwujovi.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/33jfotranq56fevedve0b8mvan/31264449816.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbea47e788---18890971616.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab0037295---jevapij.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/335c38dbb5b99d475878ea3fa7530649/mukujome.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/92497156489.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4864e40d33---48678037021.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/476eb20a8c7951b5a000d6685e959763/90901347891.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/gixowoguv.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/180c586eaf67148a655a4cc2b99c4248/nobubolamaxopabizo.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 1684 bytes
SHA-256: 50d94ef29ac85f6c4a083071b0dc69e6c423c073c0f9f258f9592e50426ffba0
font_01_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 5680 bytes
SHA-256: 97c6470a62eb5346f9ce5e6575025e10df075f8a44a4f6852bcf6af0afd4feb2
font_02_sfnt_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 2536 bytes
SHA-256: 1ca7dec6c06c8b4eb45a31f4fb4c13d1e17b3cf04a61adf089e2ba4ba24089a6
font_03_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 12136 bytes
SHA-256: 96a07c56008e24bc8a52f603af1bcfcecdf69e521e5795e1420fce2d5d2891ee
font_04_sfnt_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 16136 bytes
SHA-256: 66bdf0d93cbd021aa67d5dc481453d3016824e45466e79dc2b24854872319c09

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