Malicious PDF — malware analysis report

Static analysis result for SHA-256 c530d0d70ab8e1c8…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 22:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9369eea646c8899e2b9f33aa31a179d4 SHA-1: 4313fd6d2dfdc5fdc3a26b8ec52a59e8f4796e23 SHA-256: c530d0d70ab8e1c803d44cdf7d67e52c57c2e39a1c7880efbccc662d0753017e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. The presence of these links suggests the document is designed to redirect users to external resources, likely for phishing or to download further malicious content.

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 https://garglob.ru/uplcv?utm_term=batman+the+brave+and+the+bold+ds+rom PDF link annotation
    • http://belst.by/upload/file/devexawejixe.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/4860618295.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/jexudiwe.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7805874048f3958a3c97b87be513a33b/vitotuf.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nabefupamor.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed7dee05c---60030579215.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/48129882753.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/kumiwazepit.pdfIn PDF document text
    • https://totounited.com/contents/files/tavekatekulumegi.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/32977845419.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/78103160335.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/43cc9495f4b4f760a45558c6c77aee71/jikiwovivozoxolujo.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6451171728.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/68770277796.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/36618371898.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/momigapibuzawa.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/19854497767.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/1902812444.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sujitagapazi.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/53896987813.pdfIn PDF document text
    • http://ridendo.cz/files/file/newokowoked.pdfIn PDF document text
    • http://blccy.com/userfiles/files/webabebanux.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_off0000bcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD9 17636 bytes
SHA-256: e93aa7e9904e9c9c243e5b3a426dc0f76b30b33ae7d1104180d67cd2b4d42a63
font_01_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 10680 bytes
SHA-256: 5ddac2bdf65e590d064ceb6f536bc073ae1ed2014398c17ba13b789497d88809