Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a621e0e47195076…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 18:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f8a2e7d6269c6051c5ff1d3ecd174b7 SHA-1: bc7cc6db352a3b55d374f55f565b61b628443e6d SHA-256: 0a621e0e47195076d82525c82145dbcb912f06a9270309583b85234b149c0136
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The presence of UTM parameters in some URLs suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=samsung+galaxy+s3+mobile+price+in+nepal PDF link annotation
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0c10e9924e1fd6cb8b385532e2284c9e/rudunuririxibulularus.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/vebonalew.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9109af7f.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/62428175652.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/tokuweroguzozaboviden.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/47840470715.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/26881324316.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feab2084fa---74640808176.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0lktsvr2nubqkb7prq0cqbg9aq/46438804321.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/42023984415.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03cce61ca---fevojopefa.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/24047275801.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/21705963838.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ftf366eo9v61d6k0oh17j39l91/gumidivu.pdfIn PDF document text
    • http://gojjang.com/uploads/files/18041140833.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/dusiwezenijugonuk.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e2ka6b73bf971suskivq9uikb0/jafexelegafogutepetek.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///2489973066.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/69455205460.pdfIn PDF document text
    • http://ahknchem.com/upload/files/fuzulefirado.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cef8a913f---solipokokufiru.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/bofej.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/88408909196.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/44121604728.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/bufusekovipetirug.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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 19468 bytes
SHA-256: 23dbd1a1035c68ef5a5a686ac1ede8069d930213021a548af3ff5aa821fe2cb9
font_01_sfnt_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 11324 bytes
SHA-256: 124be7c6225b2b87677dcec54e5a630b2acec2d7b3001c34d7f49233e956816f
font_02_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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