Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c33430b2ba50ef…

MALICIOUS

PDF

90.7 KB Created: 2021-08-23 13:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 88ef47b877dd3780de08b39bef0030f1 SHA-1: f6b786c33a81b328b6bb8a71bfc8dcde7e2a5132 SHA-256: 42c33430b2ba50ef43f5e511f44f215a774bbf5522d8d211ef1422c07891a702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crysiq.ru/uplcv?utm_term=3+phase+complex+power PDF link annotation
    • http://aplus.to/userfiles/file/kijewemubox.pdfIn PDF document text
    • http://fxmeat.com/upload/file/9a1cedee9249d93089429c2c4fa4c3e6.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/17ae2e9468e58a4893e90274ee23f07e/refibanexiridumu.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/83665842080.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/pavakoraxupe.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/15d121e0e0672f58f74dbe6f0036ae0e/20780615037.pdfIn PDF document text
    • http://usateatop.com/_upload/files/benemuwom.pdfIn PDF document text
    • http://ippon.lv/uploads/File/xonevu.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/82361707783.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/88540814472.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lodewute.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/16616945292.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/66064393500.pdfIn PDF document text
    • https://telenovella-bg.com/files/8093157831.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/toluso.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/72988167995.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d5fa6a924---55228220422.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/73698840831.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qm2pu8uqivm777h8d5etbpddmk/lonobeb.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/jimugokafevetoromuvuz.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/58264868423.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/1629619095.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/texogixiziguzo.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_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 10608 bytes
SHA-256: 9668a8be8924c8416b48f2796ce84ccd27bff576593c2efcd6d9d4e8566ec540
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 18224 bytes
SHA-256: 70d33d48ce4876704ce2dea56bebf67d4cbf5c93fb34661704da78a6e7dacbea