Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b8d16feea462d0…

MALICIOUS

PDF

68.5 KB Created: 2021-09-18 15:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d0cd99d6e7c29d6a7b539939c725227 SHA-1: 89c0f6aa6b64ebdd4c95a7666f2611c4072ba5ad SHA-256: 35b8d16feea462d0e297bb46809ffc093beef13490ac8707642f35beef0b92e8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and is identified as a phishing lure by heuristics, suggesting it's designed to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to the numerous external URLs found, which are hosted on compromised or disposable domains, aiming to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tramtronbetong.com/uploads/userfiles/file/wizesoroxejogapigudeti.pdf In PDF document text
    • https://breedlife.com/upload/files/nurovidufi.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/gajasobuj.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/79507946102.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/liwagodanemagalet.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/rutudezo.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109150205086367.pdfIn PDF document text
    • http://hidramaco.com/files/files/98522484752.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/xitewijefegopele.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xinibuligimumezivumekixi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a764ce538---2317950996.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614539cbe13b3---fuxetunifave.pdfIn PDF document text
    • http://373113.linker.tw/files/39572476542.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130401569d2c---lopizaz.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zejopuruxop.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210911224857_MzU3Njk4NDQxMzI=.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/soruvas.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/51310651484.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f20e4fdbf17dff0179206b5759824d0d/fojuxilizudu.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/96963819764.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/wenutanibibifixa.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xefagewala.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/48142720974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+tools+and+drivers+free+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_off0000b126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB126 14204 bytes
SHA-256: 4ddca2fc7664cba5bd37afcd929db6b32802dda5bdb2a31987955c45356a927a
font_01_sfnt_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 10480 bytes
SHA-256: 6a28f1682283c31aac19dba0db2213d20196a1a6c11d8b048aa317d584e6f471
font_02_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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