Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0a658a14798ded…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 22:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cfca32677d10f8e3b6158c2cf21313a3 SHA-1: 18237d9973950003eb8d89e2850b97ce3713c9f9 SHA-256: 6b0a658a14798dedbab46d8d5844087d20fdf48e6a6282a022650611b44c5a99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cokhixnktientien.com/Images_upload/files/36015138616.pdf In PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ekelmg339kpobcum7sg00mfjp6/guxikopitusigin.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc66bd37920---84360300494.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/35033cobgi5heghcdohvnkmcq6/buwakiviwa.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/30278157365.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/pakekeludodola.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/14251381828.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/42553068890.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/26008478862.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/zinemomowatugaje.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/fogirojenimokosidijum.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8a1541b2---8822000715.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/xodalazidubakova.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/rozukatuz.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/kigepuvujuwuzukaruxotek.pdfIn PDF document text
    • http://ibb-online.ru/f/file/larizolexalogarusupadazaw.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/17407853459.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jepebudagolezawuwimepa.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1ecca8e93---befavedapaj.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaa8083515---49598555570.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/80066312479.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725837f301e---wazejumawabalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=introduccion+a+la+psicologia+feldman+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 18444 bytes
SHA-256: 65b0395abbab348af3d944d648e821be02ad3b7afc480c6a91e5068e511b0985
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 11012 bytes
SHA-256: f39fb3d4477b550dfdb16f12270bb49a6bd69275768e36746d1cd0f1b12b4c13

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