Malicious PDF — malware analysis report

Static analysis result for SHA-256 2077b65c542f937d…

MALICIOUS

PDF

100.9 KB Created: 2021-08-01 09:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96fda07bd52001c87496492e49309f72 SHA-1: 6ec1823b298d7e6ec407ae7cee2681a129dc70f1 SHA-256: 2077b65c542f937de85e677134c1950b23ead9eb3444737e156693525daa23de
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and link farm structure are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://drafthe.ru/uplcv?utm_term=bsc+nursing+1st+year+microbiology+book+%28pdf+free+download%29 PDF link annotation
    • http://daiichilogistics.com/uploads/news_file/16386790395.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fcf235662---69363822655.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/97058777852.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/suwekode.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843cac4a74---18992760210.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095be8de9639---99247940685.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/364ca03096ce551947867ef2f9c9ec16/jizafavezozekelo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8180a34bdbff25960d6501dfe602d035/nopotiv.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f0d927d09---13185981931.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/0ae3v10stvr601jdij0fib6cq6/50510048761.pdfIn PDF document text
    • http://changdahk.com/upload/jalesuri.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-12/20210712211704637252.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/rifudimajakadusoki.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/20745682683.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/xawabefejavamefotera.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/95332691328.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3b6a162c3febcf6f8106922695124373/midakulu.pdfIn PDF document text
    • https://topupdana.com/contents//files/gokoxuxokofodabiwag.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbcc9b9eb---70403324437.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/0jij4m25qhcpntnc66dl37mmrq/boxisewita.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/desuluzinipamoboxodejuv.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///91991457756.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/pefamunulopuwun.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_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 11756 bytes
SHA-256: 3b94b735f04308ccca23ccd18a73769d95bf5b8eb82a77309e816fe8555e1158
font_01_sfnt_off00013f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15785 17520 bytes
SHA-256: d94fd0ede4a59122233dd4b317b5cd71f5a94d5611a1eb06b41464776ac501d2

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