Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f3193fe99d6d75…

MALICIOUS

PDF

82.6 KB Created: 2021-07-13 08:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 018f173f85104807d3599162d8c35929 SHA-1: ea14857753e3bc37ad260585d72c853b54479c57 SHA-256: 27f3193fe99d6d75f8daefdfb90bef03b7cc8116cf742288c00c4bb66b79c0ec
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is a common tactic for distributing malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://scriptdd.com/_file/file/44050686558.pdf In PDF document text
    • http://sanphamhanquocymy.com/uploads/files/75737171473.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/28472282189.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbec42efe---mozedoxof.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64060a0ae---godok.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1926c27f---dunipukubif.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34561ea38cfb53b00cd611ad7e28ff4d/kiwabotelilurajalizo.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/mopizudulep.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/90272389611.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5444b3dd36---wafudozozemanifu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943d094b895---44016717909.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b6316c52---50847288009.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/55229623288.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/24737991821.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/melowukazelexenomoja.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea053c1e9a---46395055664.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/297fa1d653992db531251667ba587c01/36013676559.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/tabizakevikixu.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/kuverusize.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2bcc198163dac1a218b016cb305baf64/84620724550.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rf88gclkdplagt09rpe7vkpgp0/15892623406.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47dbf2bff9---zuvunixizakir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=check+if+column+exists+in+table+sqlPDF 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_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 17400 bytes
SHA-256: c460d1322189c9ad7bbd05476c8fca4a3ed1797ba7a5c019e9fb4598bd870663
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 11112 bytes
SHA-256: b12a98cc0468ad5f596e2c0f8b486735d546c6b89f6f8f1d5c25d90a6d33014e
font_02_sfnt_off00012602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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