Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fa4008aed59570…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 16:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 573a3c4a162453a33a19ae5c937d3c7e SHA-1: 8c8172e629b0cbf545c777e2c8efec2893171e05 SHA-256: 04fa4008aed595705111eb2708253dc7526bb334fdb7640867f915b1df76fc8f
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://scbczy.cn/up_files/file/20210911_130543.pdf In PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/tekimi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/77aa6556a8eece65b9432958834c3414/75449708867.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/xazepu.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/selevawusosafiwiwurusopa.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/8232148b9b55450f8e2472c630dfacac/finekufodubuwifese.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/86292892907.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/talupag.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/60927541111.pdfIn PDF document text
    • http://clickvay.com/upload/files/73448397496.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/30787660630.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/7013223058.pdfIn PDF document text
    • http://www.ezmoving.com/file/xinazu.pdfIn PDF document text
    • https://ms01bet.com/contents/files/gufuw.pdfIn PDF document text
    • https://pmms-online.com/assets/file/mitufadalidukizewaxuvedo.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/tukusiwetofose.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/7191807834.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/jarurasareluwajagonafi.pdfIn PDF document text
    • http://trivio.it/userfiles/files/zukotitapatobujojiveku.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/podotaxejodidipegakabipag.pdfIn PDF document text
    • http://capri.lt/userfiles/files/zowazimuvapuzif.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/pemadamedip.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc22ca3fe6---71447377977.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ccdc90eed---712010054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+install+ipa+on+iphone+without+pcPDF 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_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 18552 bytes
SHA-256: 20b8a1c31cf9d55edbff73309267047110b93b45bba0d75503bea2a19502ff54
font_01_sfnt_off000117d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 10548 bytes
SHA-256: 26d41762d9ac88c3ef7a705b57c9cf466fb62913d325c4ffbd96c358e837b949
font_02_sfnt_off00012fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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