Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad4c29a9d6651ad…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 18:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4878ef9d33d135fb4bc51bfab53b3916 SHA-1: 2cae7ba129c618c2f431c4b18be1c0d9f1e10d4c SHA-256: aad4c29a9d6651ad9c0f12d394b52a50a3322ceac4867c3fc9b12129d0f4f7e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to redirect users to malicious content. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document with an action trigger, typical for hiding clickable phishing links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yaan121.com/uploads/files/202109222237583197.pdf In PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vk4cbm1p2jc63pjsrm3p11fup0/4562938442.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/jakepixiwimagi.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/paloro.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210924235219_mc84vj.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/gozejomudoko.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/fexedu.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210914165315_1363054817.pdfIn PDF document text
    • http://moretonassets.net/userfiles/kupekadunuguxijoluruj.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/ripopilizusexovupe.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/71621246668.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/tikefebifatusuwamuxik.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/30498142630.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/kisugisuzax.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kasoji.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/gozevegujuboliwoful.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/65890214527.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/nimesemuluzogazovil.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/5133784476.pdfIn PDF document text
    • https://reha.bg/content/upload/file/17213352226.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/72538967558.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405a64e5003---44477126214.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97d321d049760b0afd6dc8db8f4f4c39/95080739682.pdfIn PDF document text
    • http://ccshecea.org/upload/files/33679646030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=photo+blur+app+download+apkPDF 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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 10516 bytes
SHA-256: 254e8b54c3b62459b2b988f4185c02617987837812d2c368a0caa7a6b5c56c89
font_01_sfnt_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 14456 bytes
SHA-256: 4a87245123a0c611d5a6fde2c7843bd8fea33178af7716afcdc8d0c8f9731251
font_02_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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