Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4795fa6a0a65bfd…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 04:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7f82298df5e288e80e4e61f07201aa1 SHA-1: f02c742a552e4223723dfe20ebb24e70fafa054d SHA-256: d4795fa6a0a65bfdbf342a528b69a0911d5b8cbd92688efad21c219121230fed
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

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://synerhu.ru/uplcv?utm_term=is+it+possible+to+upgrade+android+version+on+phone PDF link annotation
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/monotanegodupikusarob.pdfIn PDF document text
    • http://palami.by/images/file/73756609039.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/wagoz.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/26971489491.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/86475289584.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/0jpcuqpa6n1ifqlhte380p9l2s/nusufuxabip.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/mizexusami.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/57739056234.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/25970489895.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa476101cb---70864991375.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/tenaxevezegadujis.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/67839470018.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16143d8ad44d7c---65629793081.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/30055592010.pdfIn PDF document text
    • http://szm.hu/userfiles/file/kokezopasiwedaku.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/xizarel.pdfIn PDF document text
    • http://irths.com/upload_files/files/biwug.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/fepif.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/33873878680.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/kifuloto.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/38070914825.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/rewejegufak.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_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 18148 bytes
SHA-256: 484b20bcda9ae08fc1747957df016dcdc42143a003190fadc145ca5289d84253
font_01_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13475 10928 bytes
SHA-256: 747ece44ab3782f717b9cdf8687cea00f6d79664ea9787e5471e5469dc974b46