Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac1d8a1c82ca92d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 00:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6031c62b7fbad984d305c327e56ad48 SHA-1: 95c73720a5f1556f3e5a92cbf229f118fd9f667b SHA-256: eac1d8a1c82ca92dbdb3c936d4d47a67262ce5ddb862f5bb2a9b98dd8e14ff8b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised CMS upload directories and disposable hosting sites. The embedded URLs, such as http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/68618c560fda8cbcd838553e8652940a/gakuwozudemimakarexu.pdf, likely serve as lures or downloaders for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://eletvital.hu/uploads/files/98097212739.pdf In PDF document text
    • http://www.sudaff.com/pics/file/19499195712.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/86e4ddcd1c6573ae0b34b7ba6906c92e/72967577893.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/39164269044.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307e78cd7d4---50847858281.pdfIn PDF document text
    • http://sunway.me/uploads/file/080952515171.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8583ccj9c01c9ao27nevrts339/35613995442.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/tikixigolopir.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/54278098152.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/22617806987.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/81636802949.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907235107625552.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/wasapafijewogupugubexab.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/kefokisoxigudogokama.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/5402689501.pdfIn PDF document text
    • https://tpk-m.ru/files/file/depexalegejijajed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc8824808---jujiw.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911205121.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/66567819893.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/68618c560fda8cbcd838553e8652940a/gakuwozudemimakarexu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dupiremutoximanalajelix.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6702070ae---31110095384.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/83917997137.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/51750026364.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/41600132452.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/83674708325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=voice+to+text+android+phonePDF 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_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 17024 bytes
SHA-256: 8231fd26f30bbeeab6cc022d2aeb9f8e3b0d8a04edf369e8b9212641e9751388
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 10468 bytes
SHA-256: d34bdda21bd78d7fd1ca27507762c0e620a8d3886ba0ce0267b716d20648eb0e
font_02_sfnt_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.