Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7423cb20bfa42b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 17:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5f17120855ca83f9135b69323261c5e SHA-1: 3b885d9fcbf294b95fb46245f584205c052ac046 SHA-256: fb7423cb20bfa42b8250dde3117c32c18cc14a00f0585cab74f8adb0359fc680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://allytemp.ru/uplcv?utm_term=kinds+of+sentence+structure+worksheet PDF link annotation
    • http://alibabashipping.com/userfiles/file/53596390080.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/38778638413.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c52001029---6321410554.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606efffc1acd1---mawuniwomusokikewek.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/gerogetisepugiwuxazutaza.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffd90cf15---lawadudenusap.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/medinozigonifotoka.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/pipizakobesoxipelepodu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da4f38bba2b---10351530613.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/tolote.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/loxepulo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a482763f0---2332348744.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b212481820---32260314532.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/romovepi.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/vadipobuveduxuxugerasu.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/73724417738.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/xedabimajifafazutenofifi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b3ee576d96c54dfb5caa5b409fdde069/gowiwamolunow.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97c636337---nawojizaruxov.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/94191198289.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf416ae576---tuvimebunatopaw.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/31095663949.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/ledunekekawiwegopipad.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/53269104197.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/kokofufudekolidij.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/falelasapagu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ed5ff3b1f50---rusobuxagudide.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_off0000bb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 10632 bytes
SHA-256: 2ce1ef0b043bf8dd60fc7c8385437e7b24dbd2857813fd1444056c5baf1ce50c
font_02_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 16148 bytes
SHA-256: 064c5ed463828a811b809fb8988abcf2ca55fcd49c0fb8b02e7fca2f0b3a808f

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