Malicious PDF — malware analysis report

Static analysis result for SHA-256 3034f9657ed448a7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 18:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f47befcb9bab327e69eacc12928f27f5 SHA-1: 18d8039cb7056f5fcb74e74651187c3d23433615 SHA-256: 3034f9657ed448a7d6e973936392eee4572ecc51fcf43046e312d76191e30f56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected 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. The PDF structure and numerous embedded links support the attack pattern of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5034fba331---bebajodadavakojikogaf.pdf In PDF document text
    • https://tort-art.ru/userfiles/file/zepoguwixisewupuso.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/bamavufeguxegikuro.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/22906046167.pdfIn PDF document text
    • https://network-italia.com/file/83426271592.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1ebfd20c2d78d054f6de1f57da706876/nodanosak.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/11598051634.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/wesamabosajiber.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/jamememet.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/j5p8ljj1in360v2oatj0idolc7/tuluge.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/35632473967.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dafa1cc5e34233d8e7951a92eb20822f/44717673632.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/69c170a1f3c374a1c3ef497576915994/30048992572.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a25629ebed7eb3f3885aecbbd6ea51e5/11136095846.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/38046882159.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60F231BCE8907.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/gejev.pdfIn PDF document text
    • http://nktrading.qa/file/files/karowovaza.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/53798302532.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/99189140883.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/76960309104.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f032ec586c5---87199319778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=calligraphy+a+to+z+worksheetsPDF 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_off0000c25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 16980 bytes
SHA-256: 6b1c51d9d5e14504c932088140f84d70367dc103780285aaec1bd4f71b5575f3
font_02_sfnt_off000106f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 10812 bytes
SHA-256: 24143cc4ec13306b80b7a760c6502dc9bf4f2f5437abc75b44362dc34a5b4df4

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