Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ff33d918b1b554…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 04:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d29cd4fa60b100d3de4aba0aacaf4a05 SHA-1: 144c4644cf135258b777c89d6bcd7bc25268c20c SHA-256: 16ff33d918b1b55485ef4e3be3d76618bc571658b42881816359b0108c38f22d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. These links likely serve as a lure to download further malicious payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.mearesandassociatesllc.com/siteuploads/editorimg/file/fulon.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/253215328.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/rikulipisipolekisufejezeb.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6e0eb880b---babalejanale.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/80610056985.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/lepovujerudu.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/xokotiwepipapurifo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbb48b1183---70420015052.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9d90b7ac6ad41f2cf19b5d06c7024d67/xamimazedofojukadimiliza.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/lizafapijekuxazusiwim.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/20440737710.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/63224533169.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/67875734458.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/49592719385.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/85102435626.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/fijevuv.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/vikobibezusodedas.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/nefikut.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/47372223542.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/niwarejivos.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/duxagobamezomowipov.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kadadiwew.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/gefaruviwirurazedogaruke.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/3614555385.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/50d7a04cc51022349af6dbf968c1d33d/85871383324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=super+sume+pro+apk+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 10716 bytes
SHA-256: b75bfe053a90570d4e4d79cf7641658cd8036341414f2b4998c0ed854a0d7bd3
font_01_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 18100 bytes
SHA-256: d0ba4fd9e06b4fe1896e0074cdd91e290205a5a97952775ea003b96c739b95ab

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