Malicious PDF — malware analysis report

Static analysis result for SHA-256 76824c77d1753c60…

MALICIOUS

PDF

92.0 KB Created: 2021-07-08 20:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 083d36a7d2e617f1b9438e3b8ade6e9a SHA-1: 96adbbb9ab13d6e921775e5e82785c7eb16d3d57 SHA-256: 76824c77d1753c606ec42dd004c38956dc353965f0e29d588bca32a25c3b15ff
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The document body is heavily obfuscated and appears to be non-readable content from the wkhtmltopdf tool, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://dubaimotorcycletours.com/uploaded_images/files/zolanaralaz.pdf In PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/821fa082a8da2710801e7bc5a813a4f8/tubukazeri.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/d198a13a1ffbaf95345ac602f6867763/mexebomukefe.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/siberujefewukitanox.pdfIn PDF document text
    • http://yuha.be/_files/file/83187137098.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hssrmeqbpkbh2r7npo2mkl2gh2/91697127534.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/89013024575.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/61287238785.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e22356f3e6a94c0ac6514a1cbf07ebbb/37379871949.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2caa981bfa---rojobigojal.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fcff2f4d651c938317ce6149ca98077/21933715224.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2edfd8300---gumarabaxovax.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/27149674664.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/66971949654.pdfIn PDF document text
    • http://boxethai38.com/upload/file/jilabarajebuses.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f9e0064f2d411b78487da09bb71437db/67450028482.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/95816504968.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b91105d21---68720610306.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e699cebcff05c6bda9c5a04423bf9c94/94044645093.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/aa4d8f6a2b56c20c3f09360505fe9b1e/niniduwogominagaxovilub.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b8ccf3827---gewisufapepogubemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=arbitrage+theory+in+continuous+time+solution+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 16320 bytes
SHA-256: 61e2ed07ff32f15d233f27c5454b50ffa7d5ec6206a142af03425ba7a0824f92
font_02_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 18688 bytes
SHA-256: 3359a7de5f2de95a57f4d6ee6e35cd53d11b2e3de76fc47ae58866080d7fe587
font_03_sfnt_off000138f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F6 11012 bytes
SHA-256: 66e4b7c3e0f55860c48ff1cad53c85ed407ba5a53f9851b97ede226ae8078aee
font_04_sfnt_off0001526a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526A 3220 bytes
SHA-256: 76221d8bc1b39f04202393e4c8085af6432a5362ce9ff0670d6cfc5d43f2e474

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