Malicious PDF — malware analysis report

Static analysis result for SHA-256 add26d33c552abca…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 03:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9ae533fa2160c839bbf8fd610259ec8 SHA-1: a77e8f7317c4c572bac4fe1ab1bd5d1417b6e6dd SHA-256: add26d33c552abcaf15551adf8dd044528a9c37c36a14e5e7b115257c1cf659b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve as redirects to phishing sites or malware downloaders, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=national+income+concept+types+and+measurement+pdf PDF link annotation
    • http://hzqzg.com/d/files/60822838420.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5fcbedbb81aedf3ddf1b35d88b894f5c/soduseli.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107100010585829.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/58606026323.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/51280315479.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/gurunes.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/mujejepugunegakatu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd066497e---92278042352.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d8737f6ae6827f16094b2643b02065f1/75670845336.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b4c29e8a2---58868165954.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/48910155727.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/92585872865.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/vapukinowedoragajedoku.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/wuledamoxapuduromeponawu.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/6105083932.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0b14577c69ea5d74ee6af5f76c42a4a0/69245538986.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/duwezelosura.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9771ebaede225c611f2c7db0c1cc7500/22993527729.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/55112425761.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bcad59049---luxobazuzoxufupepobitu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/98d4b4d3b5a00060691ed465e524e8c4/kewubivepifogumeninadiv.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/sjpvcuitfc8bl0t7ueocvg7428/89349734643.pdfIn PDF document text
    • 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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 16764 bytes
SHA-256: 31b5f9b2b51b65a09b708efc4d0300a262a755b5795d70d24af5da43bf04ec84
font_02_sfnt_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 10972 bytes
SHA-256: 90e51a4c94e01baaa33953751431c609c11a250f8714e624f58da5f2760c85a1

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