Malicious PDF — malware analysis report

Static analysis result for SHA-256 925ef38f4a1937cd…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 23:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3beb8da7841594c201495b32f16f873 SHA-1: 9be0aa6bb5d8bf0bec2ff428b5d7818f68290612 SHA-256: 925ef38f4a1937cdd2df35656e37b40358dba28823c572140b2bc24b01b6f02e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or malicious websites. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ladyvenus.it/userfiles/files/65412608124.pdf In PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/vuvibevobugokekoxufo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/36633676339.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/dakigazezubi.pdfIn PDF document text
    • http://gerocuki.hu/user/file/debuwenunivaledegema.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16132e54947623---fazebupometokebajexo.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/besasikizixodajikatud.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/batalasamuj.pdfIn PDF document text
    • https://ancoraeducacion.com/images/92443885702.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/88714752349.pdfIn PDF document text
    • http://24cvety.ru/upload/files/zamarupezufiganipe.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/jitefiwogaperedevuli.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e000f759b7---lagoziruzijutukoberijod.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/37857119810.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901220827.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/famofinazoxi.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/papumetudenofabajixuxur.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hnbrb69d5ffn772b80c4aniku1/zalawuxutozifesage.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/2267682899.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/nugukuf.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wudexanedepogo.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/ziwurogotosigiduxoluwaxen.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360396c8fce---jokebazebabagupajitadika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=update+android+samsung+gt+s5360PDF 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_off0000c50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 16500 bytes
SHA-256: 5c8107031b1763218c7edaf5393d77d6f1f9388bc6969c33a10d44b8c79b85df
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 11392 bytes
SHA-256: f31d4671c88af44661624b05d7030fb20d1b185b749395324498a8f3324c966e

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