Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10a0bbbd948af5f…

MALICIOUS

PDF

87.1 KB Created: 2021-08-16 02:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e201a465e07ec52f1357e6fb56b5fbcf SHA-1: be0e4c9845ac18d6d2df97de493e9905f646ffc4 SHA-256: a10a0bbbd948af5f9460584e00ea3c268bf6e7a2092ce36ef66ea97c329fb5fd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests social engineering tactics, instructing users to execute commands, which is a common method for delivering second-stage payloads. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support the attack pattern of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd3c224410---bavux.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dfk4tpm9gbuo9mqsarlml75fu1/58127194063.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/84015393921.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/budujipo.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/93291477884.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6431f0e9e---77038699653.pdfIn PDF document text
    • https://oferta.lt/i/File/lotepimarixolerip.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a9a0d8c3---voxovowunoroduxutetix.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/bifedudivijujix.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/vipadodogi.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/bebogezemurawi.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/22611290556.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ead5987c2b66c90fe2a3c3bcca6c0631/dizebotugilamizat.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6etorqceej46a0ukulluq8eij5/fotafopedowamedawafepanam.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/40228101823.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/goboxusetoged.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/zifenubuwenomipi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160732e55f080c---didiwenibiz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c171dc9d02b---xirokuwoza.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610aaa97e2bf6---187746954.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/rolunasomipagebiz.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f4c9c2cf8ae2cb8329ba7179329cff4c/forarepuma.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/47160827656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=turn+on+wifi+capability+dell+laptopPDF 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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 17260 bytes
SHA-256: 7471356a72cd3d0e273bc21b800519afafd899ba4cfcae7f1ab7fd4ebb81603b
font_01_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 10848 bytes
SHA-256: f43cdce46bf918266bc009a5f1ba66912534fd86cb2c89a6a5c8597be39a8f9b
font_02_sfnt_off00013550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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