Malicious PDF — malware analysis report

Static analysis result for SHA-256 927578b2f48678e1…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 05:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ffce326e52ec00d52851f24ee5fc964 SHA-1: 78808c849342ead1eeee55e7f0ed12c4f5f02863 SHA-256: 927578b2f48678e1ac0d6183b50eb332a41de9ba52b1cafd1e0dc17f6ea306b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest it is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=funfair+ride+simulator+3+apk PDF link annotation
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330ce2c1c2c---maruzuwufigukotusirejik.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/68055551729.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/19890887536.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/dagufaboravomorisebaxobur.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f741754a98f4cfe68f6ab6b7a9cb7260/lufusejet.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/18305298470.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/rebunufoxozerukatibo.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/53823659021.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/34035916281.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/76158532071.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/57905815176.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/kovaxof.pdfIn PDF document text
    • https://eclearusa.com/images/file/divakesuso.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/pejezeno.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d178a1c5d6---88930102846.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/sozapepoxiru.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/10287545699.pdfIn PDF document text
    • http://roocenter.ru/upload/file/55972023405.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/sazorebure.pdfIn PDF document text
    • https://chptravel.ir/data/file/53260047409.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5e93c932f57389a1ea44a44dc4f0b9a6/xadipegulas.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/gizemupowi.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/nifidu.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/pevupufavukusadivipam.pdfIn 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://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_off0000ba9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9C 17152 bytes
SHA-256: c4ccafede8c9a3191faa93655042ecc1828746c0af5658581cc35f56290c42cd
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 11000 bytes
SHA-256: c860bb68d2ac5a17bab828c3adde59af0675e97c7cce932203d2bca84651f60c

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