Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73738f9645ccb8b…

MALICIOUS

PDF

86.1 KB Created: 2021-07-14 10:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 16ca71efc00dd7bf2b98dcd63b8647a4 SHA-1: ff7509d1ee512097807e406ea27a02ccc4756a67 SHA-256: d73738f9645ccb8b4df0620a15604136605016f03231dd0d73589052bcb3b0bc
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of links, many of which point to external websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination or track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ca2c6e961ec661c381f939c124393d16/52223607652.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ble6qif8h888a1s60e457li67j/7841881484.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/jasiwofivonusel.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b15bd4541---93161901025.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/bi85ci9gt7qbp9779jq93fiht2/19662860029.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/31640601376.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086153299bdc---xomiwomojutijogi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/b9dac1140c0cc64216120af43315a825/sudene.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5572be4e8---73699378405.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/goohcrbnvaihit84beg7pmir94/23248839002.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8f26730d145667d9a6d425d55f504584/97268813764.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/5pf8ovbstvnj7lrufa6on8hs0u/63535914587.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/5b1e32b71cb662c0028a04c2a490c238/naxuzawufefuwetadejaxoxe.pdfIn PDF document text
    • http://namdolove.com/FileData/ckfinder/files/20210530_76A0DA640569E565.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/3hebjpsekhtam1a131puns7ids/zenazaxapitab.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a9f6a831---10891380494.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607836684c328---naxepozuge.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/18142867078.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/23195217377.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/50027348189.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/bugedawozawajalazasupaxam.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/sofuk.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f93743f392b5566d105e14f8eb03958b/30398619881.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/fef21cb077119ade11f2eda4b740d37a/54354542476.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5b3b8d98---puzemadidazoluron.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/20432091607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=good+strengths+and+weaknesses+for+an+interviewPDF 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_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 16628 bytes
SHA-256: 344f945961d5adce8895edf63a849285d4880eb1f902912099da4d4438eda37f
font_01_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 10872 bytes
SHA-256: 14508629d563eb98416b6513adef70ca7b39d88f9b71712d6ac5682f393d04e1

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