Malicious PDF — malware analysis report

Static analysis result for SHA-256 510d8654e58eda80…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 00:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b38277cf4c20b6514156a139f309c9d SHA-1: ed88350279593b96b707d9390d54a2f415c7f88c SHA-256: 510d8654e58eda80ab0e13e57a3cb9bfb5b0e34fcfea047a1926a10f8da4f4ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple disposable hosting domains, which is a common tactic for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=quiet+place+2+free+to+watch PDF link annotation
    • http://professional-tuner.at/uploaded/file/zewafan.pdfIn PDF document text
    • https://songhong.info/userfiles/file/60171458223.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9adf46348---78172481709.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e975d44df---pilup.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/wonitivuwas.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/77257662746.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ka1flgc99m8l0suu2deitu5qe3/2125851525.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/letewovaxabizumadozopak.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/runujusesipobekelikifi.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/24280056909.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/davubogutemaripepalip.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/80763952372.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/969262c8291f23875318b1a3d0e18f34/39755677481.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/78499061215.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/45915319089.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210902_123600.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/76242571139.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac0cf015a---43121707796.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/nukaroganetir.pdfIn PDF document text
    • http://355353.ru/userfiles/file/morutixojobuf.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/nagisesopotolavexodixofuf.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/zefisaruziwigu.pdfIn PDF document text
    • https://trexanh.net/upload/files/leposawarozibiko.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/42088543667.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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 18288 bytes
SHA-256: d11821458fee46c12f755304ca03c017fef38d3678ade2c3163e8c5d2a8f4ee1
font_02_sfnt_off00012dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFF 10668 bytes
SHA-256: 35e5c43ea1e54defb0d95b325282d5f9e60e6e42ef6ca5e3b5898201218d4796

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