Malicious PDF — malware analysis report

Static analysis result for SHA-256 44153a4d95bdf0fa…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 22:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ac940f94ff9177f8a8de5f7c18138a4 SHA-1: de919256eaef2665094a32c94373e4012e8cc4f4 SHA-256: 44153a4d95bdf0fac13d4bf39bef357bea13925d3a91b48f86f5f2f906a65574
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=toefl+dvd+download PDF link annotation
    • https://fotojursa.cz/userfiles/file/93661249222.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/43689637461.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/19374886728.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/wifadexosajosemuw.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/xisibobomitol.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-11/20210911061417913886.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/forotenetuwalamobejobegaw.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149af5739361---fosoborivupukubusovawowan.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/21444052644.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/329a76dd0372739a65496ea6bd87d62c/14290176509.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/xalane.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/99367737035.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/tapodapunapuvipej.pdfIn PDF document text
    • https://edgecs.com/documents/94971539204.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/26ceaf30854a956f747f2a33461a26c7/ninutemotun.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/31748478877.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d79b0044d294efc1f1e854e735932ab7/bakijofozonojexenif.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/11049570202.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/56279822270.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404afd45497---xagodederaw.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/vuvaxinusopapetofu.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/23779570438.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_off0000b151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 10004 bytes
SHA-256: 07f9dc0a3000ccbb8c60a2353af70966dcff326aebdfe7b19a4bf75fd06f4eb5
font_01_sfnt_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 15712 bytes
SHA-256: ddea418e630a361bef6b7cd34d67d5fe02579c142b7f7521417dca5995feca22
font_02_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1