Malicious PDF — malware analysis report

Static analysis result for SHA-256 4092b831667a6343…

MALICIOUS

PDF

178.6 KB Created: 2021-06-30 21:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e2d2661291a476e22682b412832f0b02 SHA-1: b03c479c359639a7ded5933639277519ecc49574 SHA-256: 4092b831667a63436f145f52a67eb9f84dd0f34336e2d8650136d965301af87b
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9474

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://taeguektour.com/FileData/ckfinder/files/20210529_013D3A15F5E2C901.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/90699098599.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbd00f6e5---13669849891.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vqerg7mg0kmh8fc65tssa4b38n/magosik.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/11520960930.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b73f2f593---galumazojomemaziwumoragiz.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9939c0fd23adaa53410b1009aaa9a7d/28669016236.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/zomamafegofuvi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bd8176c9c5e476a2af2f26da1ec3a595/82424066838.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/99990756041.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/30551657431.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c674fe9b933bfc293f45416ad68a55dd/69167704759.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/087874bd296ff2dccb7efeed17ed694d/50129793791.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ccb070510a500ad145517652a276dfe4/jiwawud.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kulawojuvarokajuna.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ob6rdm6o1q3s2uivla8hr15sb7/13721413186.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10eb642cf---10334844931.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bofasekopafoka.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2cc75dede---wasam.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/t9rka0bd8i3e221efp280pras4/jumatebusoruludo.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/lunekovureberikikejozuv.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bff1f2e24---muzozurisaka.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/razom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=financial+accounting+in+tamil+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00020469.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20469 19220 bytes
SHA-256: 30b4ff31b36ead79b2974b712e62281077bd1fb8ff82f2d7ad8f3dbab9c1c61e
font_01_sfnt_off0002241b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2241B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C32 10640 bytes
SHA-256: 3307ceb1393c3015b05a5f42ad575c7287d515e6b9cb08700f954f67b741ff51
font_03_sfnt_off00025440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25440 10928 bytes
SHA-256: 9f696fa42886c8bce6241825716892981efbc05b9c459bc113608b61fe6a5f21
font_04_sfnt_off000277bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x277BF 26488 bytes
SHA-256: 30a0d34970718144e4479a816db5996b59efbeada81999b06b172df3be6b385a

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