Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65554d38e52d441…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 11:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad12d274edfbe32052310624648dac5e SHA-1: b38af1d4e4ebc840d0bb1fbddfa8e18fc255e268 SHA-256: f65554d38e52d441d1c32670921dd4630fe99c5a9d25aa308bd0307310bd2c3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/78818d2516b6987f06bbbcdd76821f59/gerol.pdf In PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/43734814792.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/pixenen.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/kerev.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/wuvowitotopomizefumek.pdfIn PDF document text
    • http://mc-opony.pl/files/file/51304679093.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/12546334782.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5941ad6e6---jamonolesovoruwit.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/74626650025.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/70328309631.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/628736b3b411481f9a5bd951049eff38/92425378411.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b3a902648---53229389898.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/72697254702.pdfIn PDF document text
    • https://adikketiga.com/contents//files/34163459208.pdfIn PDF document text
    • https://chsins.tw/uploads//files/202108122314496953.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/20718941900.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161174c8c4c103---femewososakuzona.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/gapog.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2675128d82---37875156325.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/18775842342.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/fudikamudazisase.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe355f856f7---seguxabudofelokodol.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/89284866961.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba13434792c---govimim.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vfc3b25s6g9ffrkbp8bn8ektq7/86223584265.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/godimadokafopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bus+ticket+reservation+system+project+in+java+pdfPDF 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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 11288 bytes
SHA-256: c934c22d335488b2d9f073bbe7594fb3d21894182ed49a5daea35359356cc49b
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 17032 bytes
SHA-256: eeeb5162b3571d6c5f647ed2bcca861b31377b920394dbfef6910cda73af71f9
font_02_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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