Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabc4a273eef072e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 09:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cd1ba6c6aef644ddc0591c6847e8445 SHA-1: 5d9190a3b6941a0f8a7bcd0218d3e195993b9e9a SHA-256: fabc4a273eef072ef457219eeda67c6f33370e4b92ec1f818890c118e412ccf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b31d946e---93687577527.pdf In PDF document text
    • https://nusantarabet4d1.com/contents/files/39255612180.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/foxatusemarigajokumafuxuj.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/fewisemuxadasa.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/87409107248.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/14685768497.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/83862888176.pdfIn PDF document text
    • http://belniig.by/public/file/fakabujofavapomulijaripol.pdfIn PDF document text
    • https://arerp.kr/data/file///wivevunorifuwisopoweruvej.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/temiw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b6065e036bca9f7429471f59994353ac/rasevalorebevaliviw.pdfIn PDF document text
    • http://rivucota.com/upload/files/66560604992.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0ffs1c26s9mbfftmrfhao08klj/lawujifipiberutiwe.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rulakakovuwomenumerenox.pdfIn PDF document text
    • http://netart.hu/userfiles/file/24180403340.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/tufufunigoxonafozojevuv.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/68956614674.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/17796913370.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/kinetefavezegevovas.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/67974012726.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/joliw.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/31122341807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+mobile+uncle+toolPDF 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_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 10592 bytes
SHA-256: 49557fabe6ce394db4456c1a51e7fe7ddbe7f80ec88af5790ca473d328dc9f16
font_01_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 18088 bytes
SHA-256: ca94a5783f85b44878a10d8b4d4a75ca9edd9d245cc27942e732ed5526841f99
font_02_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1