Malicious PDF — malware analysis report

Static analysis result for SHA-256 6effc991d6f86b3a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 21:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59ebf434705972048de6ca8af325d35d SHA-1: bf6dd8a2e4c3807b58b81e306a47680f3b590bda SHA-256: 6effc991d6f86b3a889f1fbfcf8fb274085f9b6733b21ab87541ab1809e8e9c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://paoladebenedetti.eu/userfiles/files/34470480055.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5846u00kv1h2ev81kks83gioh3/85159194583.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/zututizen.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/10697686324.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/vutidukudobupe.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/navaroluf.pdfIn PDF document text
    • http://redactron.com/userfiles/file/74950157899.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5186bf47---tesuko.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161337186a3c5a---bijenupa.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/fujitafididowitog.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/56441797268.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109141151002910.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210908162754.pdfIn PDF document text
    • http://canvangdientu.com/images/file/93670505767.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210906_002548.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/68227227222.pdfIn PDF document text
    • https://ckmandarin.com/uploads/rimujemegaxavirawi.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/vebugezovilifab.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/noridefuzudoxojelabupo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9b741741c3c6ca257d1d544e00064396/19350488899.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330cbdb9332---79982663854.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/26593748737.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/96405795607.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///57005501652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+fire+download+free+apkPDF 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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 10380 bytes
SHA-256: 00e7d140bffe1da55c4a714a54f910ed6def3b04dd791667919cf3b9a08493a8
font_01_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 17564 bytes
SHA-256: 6b88bab4b729227c5cbb3b467b0afe5726cd0b096072aaf68c764ef80f2e864f
font_02_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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