Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc35797370fe023f…

MALICIOUS

PDF

81.0 KB Created: 2021-08-27 22:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7807b9259f884ec34efd94a21a463f00 SHA-1: b87c151d7087544fca6b5d06c5f4c855c3549aac SHA-256: fc35797370fe023ff0fc1892cb147841570d4beb875cabd2d1a27bf313d4aebd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://heatingboiler.ca/fck_upload/file/dunamub.pdf In PDF document text
    • http://petra-dario.info/upload/datoteke/tejadafixexagope.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/momaxuwibobusogalaxus.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/24951399703.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/fuzize.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160da6a9bc0841---kesaguvibigisiwu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607746126e378---vazixekegefi.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jiwerawiwifuvuvege.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5501ef2eaf6a365c65e4dcc069acefdd/93882959961.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/jitagavi.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1628359620.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/94135712123.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/mozezutiso.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d88c326739a---50272251900.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202108260420149861.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a09bfbdd2e7---nevozisogolimufup.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/5167d460476a98429f03ba3a49487171/29335762333.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/dowotukewu.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/79422776183.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/woboramefozirod.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27d18587e---jamow.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cac2865e3db---mofojesanorifivod.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/34315913428.pdfIn PDF document text
    • http://yilip.net/userData/board/file/bogebowefubafelazikulop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=parliamentary+democracy+is+unique+and+importantPDF 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_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 18404 bytes
SHA-256: 7bda0ad9fbfd3c794644e808179ab558adaee1eb6600541c02305ba2d2ec58ac
font_01_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 11036 bytes
SHA-256: d29fdf496d9926f429fc17fac60f600487328da8e6db24848e5e4bd36d3eae26

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