Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d6bd46ab79afc8…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 00:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52d1f9efa6d36900964cc5eb7d4bcae5 SHA-1: 29c20816ed28ff6190a3b5e02708e47e2f08bad0 SHA-256: f3d6bd46ab79afc8fd9bda564ab49dcc9fae0e38e62ca5207a565fcaca603cd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as https://garglob.ru/uplcv?utm_term=semantica+linguistica+pdf, likely lead to phishing sites or further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and potential malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=semantica+linguistica+pdf PDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-9-18/20210918014937342819.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/selubedukimujuvupaped.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/1237272982.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/moxewitabimo.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/pobifufujif.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dusirokewij.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/kirobulubawikeli.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/73793276940.pdfIn PDF document text
    • http://szcftz.com/upload/81469248820.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/63201903524.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/etbm5li53co0982qoqp323jhn1/7923006338.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/99027029752.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/rizobunakopidopoxo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ba51e3296---68590499881.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/97655432438.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/xoril.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/84224794959.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/sisisibibukofibedemexev.pdfIn PDF document text
    • https://wasael.com/userfiles/file/zinuwirijuwimezemaremi.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/53711989504.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/68271436231.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/35897003563.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-06-16-29-45-53.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/tazejopevalop.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142ee97a87d6---59145188390.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_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 19540 bytes
SHA-256: 841f4770bf9e12c6a841b401269c17e8f038c81026d74cd657d7b8025e64c723
font_02_sfnt_off00013ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA3 10916 bytes
SHA-256: cc0422d60d80ecb7b9c7d5166689edd6930eec73909efe7d54bc9508b2620c19

Open this report in the interactive analyzer, or submit your own file for analysis.