Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3a6aec8d33a8b0…

MALICIOUS

PDF

88.3 KB Created: 2021-07-23 11:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 968b0e41ec62490c6cae53d7329f3997 SHA-1: e1187bfdb6f34038e14fa188dc61e3c432f88ac2 SHA-256: 4f3a6aec8d33a8b0b48b1f1cc34cf2edb6501a8d9b3d82c973978f1fd69f0733
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, which in turn hosts other PDF files. This suggests a multi-stage attack, likely for phishing or distributing further malware. The presence of numerous links and the use of compromised infrastructure are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/a048a5d55655a76bc21e78b3157d8715/gekowuxe.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/44273728635.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/luzudaliratidar.pdfIn PDF document text
    • https://wittnebel.dk/file/sozig.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/tidagogivax.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210707_16C42924DE3F141D.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/88298589688.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/buvitofupavodezoxared.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8059e1920---debeg.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4b5aebbd---38922207309.pdfIn PDF document text
    • http://sun-tes.ru/files/file/fepemanomuzolezotonodutin.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s6i5t69e70kii2et66kvqeheg7/99781192981.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c073bde3911dee158bdc56e975fce6c2/19496912901.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/miwadukawuro.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/42991953399.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/60079767797.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ee9d254cbea47beaceb2f207ba98db46/wuforosepede.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/15490059273.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/jukem.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/81864081842.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/119581517.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/2434295367.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aca628677---sugasube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=things+to+do+in+survival+minecraft+1.16PDF 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_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 17932 bytes
SHA-256: 16be9215e8319f2e370fc329105cfec4a5b7a339bf8f1834f100cc9791878270
font_02_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 11336 bytes
SHA-256: e02518586a1be884d54fb0d8364d1a1ded329b164081d0b94d9ba3836f2a7132

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