Malicious PDF — malware analysis report

Static analysis result for SHA-256 4335af3f05d5020d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 09:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ebd3077d4065206b46fb88a67bc5091 SHA-1: b0d10d7258d9b54f1733b18bfb40863ba39fc93d SHA-256: 4335af3f05d5020da0ff62f2ca84a6ad270e617e16ee07ed21bfb763092d7b3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8669

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://hostessima.pl/userfiles/file/berizigajefuxuvedikivat.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608308967f42f---kugadidomomowanopanux.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d8c2bb88---58931289163.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/88644505261.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/lktv0a05egu2lcmao4qbjmqj0f/sokijezufelar.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/27478785899.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160881964f2aa4---jiwulowubuwafilegoseni.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/tetepudewerodubezuko.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210805_2FB6E026F8DB170B.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd176830bb---xuribolirenejiwu.pdfIn PDF document text
    • http://aven.su/userfiles/file/rowelapedisupuzijoliki.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/wizej.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/53f933129d4734b380cddd5b9bad7543/91470240179.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a7307d97c---didibakaveruletigug.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160728369e39d5---94698387522.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/55273152725.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0357cea84---57279220579.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/kujupobatodekenoluvofuke.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e53c6a50b0a---64066113510.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/30cf6a589fe189d66ab10947e9a21dd7/15669969012.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f672cci4qims3dg31hvgho73vr/17034285138.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/80208539912.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/26053488479.pdfIn PDF document text
    • http://soupworld.de/upload/file/getirulividisanusojub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=adobe+animate+cc+shortcuts+pdfPDF link annotation
    • 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_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 11060 bytes
SHA-256: 13d5d2459a1a52ca9165e36c1829e05e7f67aaa2058b9ebebcb1f90a05c97296
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 19004 bytes
SHA-256: 9fa42edee5fe0fd7ab634b0bb67b63e1ff6289412c698a6206e58d78a620054c
font_02_sfnt_off000138e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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