Malicious PDF — malware analysis report

Static analysis result for SHA-256 2542503bc118754e…

MALICIOUS

PDF

88.3 KB Created: 2021-09-16 17:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 78ac5bee568c8e0f28800a2bfb51f7a6 SHA-1: 9ca6a9449679d2bf567f4d89bb279d508a8ca9bb SHA-256: 2542503bc118754e9dfe4f9f0ebb197a6663df3a6b543e7b3bfb532b311a4985
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain command execution tokens, further indicating malicious intent. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://infrive.ru/uplcv?utm_term=master+ball+fire+red PDF link annotation
    • http://mabo-meccanica.eu/userfiles/files/fegelamesawimagupirodi.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/37616894420.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/9453707323.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6b1351e4240607b7cd030633b3c38418/53685364729.pdfIn PDF document text
    • http://reylab.com/userfiles/file/zegije.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/39049532231.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2c529a52fbe6cb6c09eb273eb7ca669b/samojumaputuv.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/tuwobunifapegarizokoto.pdfIn PDF document text
    • http://usateatop.com/_upload/files/nuvisu.pdfIn PDF document text
    • https://rais.bg/uploads/file/89219042031.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f26d523ba---92429742171.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/velatugofunigizawopuvopu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/goritugix.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/19145953211.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tejebevumususoduge.pdfIn PDF document text
    • https://equimat-cheval.fr/file/foxigaxobuburizupatemu.pdfIn PDF document text
    • http://rotang.net/userfiles/file/59427986468.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/vuvowuzufudu.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/topiponitokefa.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/12541125343.pdfIn PDF document text
    • http://qdcmd.com/data/files/45863626421.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/venawopana.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/wimikuvopivun.pdfIn macro / runtime command snippet
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/bumaxodegavorima.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/dulimudopanidaramojak.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/wajejewek.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/potifeminawujufebe.pdfIn PDF document text
    • https://maggievanostrandIn macro / runtime command snippet
    • 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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 10256 bytes
SHA-256: e8e4e86fd4cb51f9372eeeeddf2304d6cbbee1df03f063c1dc035fd19b930e49
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 20508 bytes
SHA-256: 5ec69e9d850a458c542734907d16b39cda17c2a38ee53eeb56f95cbcc45b8523

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