Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05e1cdb5715acf2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 22:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe6af34833397e36ed8c5258d055a426 SHA-1: ffb06cce9f563f085db232c32b32c8f281a7a046 SHA-256: e05e1cdb5715acf29140303505bf35cc325d199395f1680933f35154a630c907
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613776bf72c1d---19618923274.pdf In PDF document text
    • http://arkystudio.eu/userfiles/files/81655103894.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/josozizipivopabegilaban.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/xaruvuwitexeparutanenefi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/3341c359d56e821b0f0f9292d736214d/68839136071.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/butaru.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/58116396065.pdfIn PDF document text
    • http://getem.eu/files/file/66142436875.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/38050417799.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/bebeme.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/14557405736.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/xeboboberatagevamutuner.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/buzorejavezexoke.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091722425036.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/85554285066.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/62240324734.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/53bd86276f6f048d5f408446cdaf1318/33064175799.pdfIn PDF document text
    • http://freewest.at/67002116829.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/73347955354.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/52283947435.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/zarokepuniv.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613f124141048---xofezepilimij.pdfIn PDF document text
    • http://www.520amis.com/upload/files/tosirulasigolatuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fake+camera+android+11PDF 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_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 23948 bytes
SHA-256: 0f11c0b3529151bab0611eae64ed86deee1e2a1eca13877ba6eacbf7a8463cba
font_01_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 10340 bytes
SHA-256: 9441c17dac23d664497d66a96c71fab23eaf173278b609eff8c3d8f225e83198