Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae10eb95c11d98fb…

MALICIOUS

PDF

88.8 KB Created: 2021-09-22 23:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e9f775b8e49adb329e476d6aa296547 SHA-1: ff7299f1f81807bdc0d2a1a4370ee1b6a38557f6 SHA-256: ae10eb95c11d98fbda0d53c24ca92c972b339677257ce6d4f7ffd3f9dc831619
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1184e1f2e---76026026017.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0d7659ea9fda3f4c1885c26cf8887ac8/vapap.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/67792778152.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/vojibogaduj.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fe2ebf9---20931179844.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8529c3986deb7d0e1250e01a847a049c/63870775994.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/40189345918.pdfIn PDF document text
    • http://gaudi.tw/upload/files/nakaguwijizivosazulos.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/6701226888.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/salawigilejefakuwezas.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/xafuxalefitoboxizufigon.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/gabulezozokipebiper.pdfIn PDF document text
    • http://patroha.hu/file/35490608010.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614275472e1b7---ramamamomajiz.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/62973731191.pdfIn PDF document text
    • http://offerparts.com/upload/files/xuluxizo.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/31410582427.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/45828979511.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/78818122953.pdfIn PDF document text
    • http://szhlfz.net/upload/lutimewadotadogamek.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/zelijike.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/77662002491.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/50381431735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=safest+games+for+androidPDF 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_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 10724 bytes
SHA-256: c3e37058ec4c7d77662a1ad8981d5b0622c9166203d0ee71999d7346315c5a3c
font_01_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 18012 bytes
SHA-256: a4a27ac01c461f7b8d90e58112a7358f15e222a0c7f79d0d8b3c6c556d628dec

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