Malicious PDF — malware analysis report

Static analysis result for SHA-256 633318fd41ed6f27…

MALICIOUS

PDF

80.0 KB Created: 2021-08-23 09:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2637535c56726ef331098491ef836dbb SHA-1: 8975cd5abfd41ec35486a4e84bb8266ca26ffb3f SHA-256: 633318fd41ed6f27555ce945d41ab03e4736812b84f81febe676679fbe6a6b12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall detection suggest an attempt to lure users to malicious sites, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://dlevitin.ru/fck_editor_files/files/86508238075.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uqs074a0qo0mi070rv18dhhs12/29119720298.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080783d90a34---jemajuxatarinuraz.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acfcd91550---vofakogabowemew.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/xofajuta.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/41543298740.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161168a34c1ea5---fumizesukekufapix.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/22316139931.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/406a8a919eac12c9c0bbf6352267776f/94461249277.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df877fae7---79284028075.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/pnjprcfl1h3pn4figfkcqku3f6/bujulefo.pdfIn PDF document text
    • http://expresskaliski.info/file/57179556737.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d142a96246d8018fcd38cdb822c03800/belikinibelasizin.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c5543f3c---10735142770.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/nebifit.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/15067277272.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/95398888005.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kolagipumizan.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/33061879213.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-31/20210531043354649653.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/nbho8hklenjhdgqnu7gjk2cafd/67808021586.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/farazujejusapidokubiv.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/fupejere.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ggljggpam7kfq62kaj5deaoufq/1154207672.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/sexolulatipivogaxujufizil.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870797de9fd---miwalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+world+on+the+turtle%27s+back+iroquois+questions+and+answersPDF 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_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16572 bytes
SHA-256: 276cfe928eb1c2c58ae329df772ef2d8057e1d0cfa16509d36c112605b86d65c
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 11028 bytes
SHA-256: 3a3c2f4d438bf115841e58b0153de123f59f95e678fabc83d75c6f09d1e46420

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