Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7102d14aebfbdaf…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 07:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 153831de51bb8a566029b28d7df786ad SHA-1: 6d5acf1d89256ec24d0836735f200234fb043357 SHA-256: e7102d14aebfbdafcb62f9952c9e12d6f4f1875f83d853e588c167227187aa7f
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://infrive.ru/uplcv?utm_term=sharing+kingdom+apk PDF link annotation
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/wobilituvipijumexogul.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/78776082208.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/43375188432.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/volodaromu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cfacabbd5---kobule.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/004343d8d0505a848b42cbc22c9c12ec/75185238905.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/86769085306.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/zaxefirabelakemi.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/legafupizotimogodata.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/61835938376.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/vofoxabuguzosedixopavan.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210905025333.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161354e26a217c---nigamavet.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/20311183575.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/49034288641.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138a60181b59---silam.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/26232068855.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc563a1e3---64517660745.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/77152811541.pdfIn PDF document text
    • http://atya.eu/files/file/71524039443.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/momobazuvebujoma.pdfIn PDF document text
    • https://wecareprogram.org/images/file/pejukidip.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/napubimutafuxojexowu.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/97503147262.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/53016916656.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_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 17704 bytes
SHA-256: 0dc8281e26d47ddb97bdfe13bb5dbfaca6c1c36c10d4ae959b50e5e1b24e6834
font_01_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 10564 bytes
SHA-256: 678932c411481aa866c3d1012b30511bdbd237e433eccd32e79df503ca646544
font_02_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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