Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aecda5f62592c22…

MALICIOUS

PDF

73.0 KB Created: 2021-09-29 11:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d0e0888574c7d0d0f119885e727f47f SHA-1: 456419cf0d7cba2623ef134006b888ed9d4d7200 SHA-256: 6aecda5f62592c229a625d60b55761fb568de84204aa7a1c8bb2b1c4cc9e1765
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution vector.

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://crewmak.ru/uplcv?utm_term=use+office+on+chromebook PDF link annotation
    • http://hopkim.vn/upload/files/65508043983.pdfIn PDF document text
    • http://seamacros.com/upload/file/wapubakegula.pdfIn PDF document text
    • http://yejida.com/userfiles/file/gotipo.pdfIn PDF document text
    • http://mayjack.com/upload/files/jovulosa.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbe16f7c6---voropudi.pdfIn PDF document text
    • http://jonellchem.com/upload/files/75636648198.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/lonulavuroruwolekugede.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/71397566150.pdfIn PDF document text
    • http://goref.ru/files/file/simuguk.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7b59ec79---viwobebuvenuweko.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/nimiperologuremuvevuzosu.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/kuzepobasax.pdfIn PDF document text
    • http://melabo.com/upload/files/momumekezesawisaganixu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e32b708544---juzidikexexovojebekufi.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/tadimuvimidavofuzifipe.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210905002407.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/kagavupatazujotopivobiwi.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/79895025453.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/23808824796.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210904054725.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/26528807334.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/236eq31ouuepsucmn1coucu9r1/fakabejemirafokamokufeva.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cg7uqok9pjh4ib8ldkr8ropuv1/38085842463.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_off0000b630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB630 10532 bytes
SHA-256: ce954e1f8a205ed3b2b92b487874ff5a308a5177259ad6993ed8c57d7479b91e
font_01_sfnt_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 18684 bytes
SHA-256: b75be052886f8e88ee0bc4eadee7718533cb2835500a91add0a96c42fceda18d

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