Malicious PDF — malware analysis report

Static analysis result for SHA-256 a271530b20b38e85…

MALICIOUS

PDF

87.6 KB Created: 2021-08-20 14:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16e744caa75688b580ebdd9d92d67b3c SHA-1: d51e80b4fa1cfa91e2c81f028ca6e7080ba7402b SHA-256: a271530b20b38e8559c643db54384d148bcedfb202251b0976f5792810fd46ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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
  • 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 https://aedwea.com/upload/foto/lejaxufi.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7e42656e---kexizujemijufagupemutaf.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/98422008681.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a70eec6e98c74459c8308f6c406b0095/libukujobupelotulujoxoj.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609676b6db741---gerureliwuve.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/78444374319.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/jabadiporebuzuluxexazex.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/zozuzedaxamatupituxege.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/bibozimefapimoxow.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/tuzosirixatedu.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/daxabukixaron.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/muzepanixiberizigisidi.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/12360026191.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7a6b7d64---25043404629.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e54db64d5---71540056497.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/linotanivalefarajibero.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/wibaverakofewubesozujam.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f76ddaf3e---99363385271.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/dowiwujebusixunaxigeju.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16231762872497.pdfIn PDF document text
    • http://melvin.cz/data/gegatedus.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13063015f5---patasexirisize.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d208697ca4c---56072084496.pdfIn PDF document text
    • http://mastervin.ru/files/file/20048325233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jalwa+tera+jalwa+mp3+song+download+dj+mixPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 17568 bytes
SHA-256: 452aed920b9c2dbe623babea561493657c9c21823c40ddc095ee2413643a6e44
font_02_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 11216 bytes
SHA-256: 4afc18b8a4c6c9e0740ba16f8c650a6dd7a7fad5ab189b975f4f1592de7e5531
font_03_sfnt_off000136b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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