Malicious PDF — malware analysis report

Static analysis result for SHA-256 3061aa1acb152faf…

MALICIOUS

PDF

92.3 KB Created: 2021-08-01 05:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56856980194e011c86505f54fdea6c0d SHA-1: b4ddc2457e7f4f77aff6c95f41bd4bb64a7b8843 SHA-256: 3061aa1acb152faf3b70a1df374c0c67bf37999fea804da23067f4d5a6e58f27
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains multiple links pointing to compromised WordPress installations and other potentially disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to external sites via these links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/fab65b58b0d5011227bd2f6323cd8221/selifiwadokebebil.pdf
    • http://washchienluoc.com/upload/file/24964703473.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdef4a1334---4676780325.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/39919458038.pdf
    • http://ssatripoli.org/userfiles/file/71673829792.pdf
    • http://myphamlulanjina.com/upload/files/xanugokunufumov.pdf
    • https://minhkygroup.com/luutru/files/mijugepikifegalafujig.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831e0970a5---zevetanakiden.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1276c2b5---fusawiberusozasamudewaso.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33164e896---ruzokigavof.pdf
    • https://zzhqhi.com/d/files/rakewarid.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/wimeziwaxofuguzag.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d5441fb3ff7e9771d3e47b8a12f714c2/munefazugese.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4779129c75---posoletizivodagoxa.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16089d851511bd---felome.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3bd389cdd---wiwagifudapol.pdf
    • http://libron.pl/fckupload/assets/file/84332784491.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/db23fb3a035d1dcf1b8defff02933f56/bivoni.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/25f700e585a6de42bb85e420934a6750/sugedotuvoguwag.pdf
    • https://mashura.co/userfiles/files/gigiwarevivek.pdf
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/getanogozumefukeger.pdf
    • https://khanikango.in/file/9605204336.pdf
    • https://urbanlivin.lu/userfiles/files/87753375748.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a284833e---bawebi.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/97ca7fd64f0add3d14dcd489e3f1eb18/lusezekojenutewigifolo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+order+of+the+house+of+night+books
    • 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_off00010479.bin
db64a04ecbfcbda609a3cf277ff349163d085e2c9966d7bc5d10e58852940bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 17128 bytes
font_01_sfnt_off000130f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 16792 bytes
font_02_sfnt_off0001490c.bin
c1fe6051d84917bb7069f29aecd8a287cec7ddfd6d1fcee99c8b43bdd93ea7a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1490C 10912 bytes