Malicious PDF — malware analysis report

Static analysis result for SHA-256 5615576cb42bce5d…

MALICIOUS

PDF

113.0 KB Created: 2021-06-26 11:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32082a17f9bf2f372a78388e9dfbefb7 SHA-1: 37399b752cfe2800caeec59a1494d761abfd88d3 SHA-256: 5615576cb42bce5d6fc5fb12d21e07d580df543e2df1aa16c02eadb9870c2413
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and link farm structure indicate an attempt to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=what+is+the+inheritance+pattern+when+the+dominant+allele+is+not+completely+dominant PDF link annotation
    • https://arch.ua/ckfinder/userfiles/files/70839737811.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc9ca922d---21139914767.pdfIn PDF document text
    • http://sns.hu/_user/file/44136562494.pdfIn PDF document text
    • http://bienbao.org/uploads/files/90548317375.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/gexagebox.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ca411f97e31---7809425137.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ffb6cf51470538505ac57fde2e334e36/jasesimawadewasalaka.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb18a461f---6429942400.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/biriporaj.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/55852278958.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/wemawadubadobawani.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608794a20f48a---97266202125.pdfIn PDF document text
    • http://www.bandungmesin.com/file/vidunawuwezuj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083093c57294---bavoxufurukalaberaxu.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/larosise.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/78492463000.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/89932202560.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984ab38ea52---41953454987.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa50277eb---93268037171.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741edaea137---55141152208.pdfIn PDF document text
    • http://mosjob.ru/images/file/joxomozokoxoruvoke.pdfIn PDF document text
    • https://12tiga.com/contents//files/23808826471.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b35dfa6e---45939465393.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/solowo.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_off00015032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15032 18760 bytes
SHA-256: 344531ebed6ed23c6e5f4b62c059a1c26d55746c1f31809d9dd417a1ab382374
font_01_sfnt_off00018201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A18 10972 bytes
SHA-256: e6bf5c9692f04b7eb77ed834887852331ac0ab9e1c512f439f29b880c4decc63

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