Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb996260585cb77…

MALICIOUS

PDF

90.4 KB Created: 2021-08-11 09:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18f0ded2b45369da2c2a8c0b654c2543 SHA-1: 1addc17cd35969b35a28b7ce482e2a458390b236 SHA-256: ecb996260585cb775b68704bd67899f92da1aa4ddb450714bcbdaeb9d406d501
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure victims to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jcon-aps.dk/userfiles/file/91356282996.pdf In PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070708355473499.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ae2eb2f1---bazigevosoduvipov.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/gorinaduki.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/28359362310.pdfIn PDF document text
    • http://adveotec.com/img/file/11377513184.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/56634872809.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210715_AD080822B60809EA.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/0rtbqstuglfjj09vm5os519esh/narijanititofe.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/vapumasogivilozawodaxe.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/tfb7048p5u1rotguadbrjv8ou6/96040935637.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160de3b8f12155---54725655413.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca75a5e9c3---63799207968.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/jamitelo.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/wujejujenimategurowijasin.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae915544997---pexurubadejuwatogujafiw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911f2b9c5dd---81689273936.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/87408584161.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/se86tmpd91nukd0rff0s2cgs8h/91948241624.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79241a474c---43425685929.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/jobisemipenadib.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a2e8b65003b1f62935a4552239663c2c/jibutepiwabegitopinavom.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/57220603000.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/gikekulonelogox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=petsafe+2+meal+feeder+troubleshootingPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 11164 bytes
SHA-256: d2999d4fd743241ae973fcb3f5230e659146d44a612365aa28ef1431084c328f
font_02_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
font_03_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 18224 bytes
SHA-256: e9de871c04664f1538165657e6022838664842319c2ea8c12d5286053f44a863
font_04_sfnt_off00015141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15141 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832

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