Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0e100db3825f7e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 06:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c34ca77272bcada282cf983c295f042 SHA-1: 500c420a82be6c21e1f2287da54a20663ee034c4 SHA-256: 6a0e100db3825f7e6f0f0c222a7162c283137aca330a6175a91f315c074e96c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on distinct hosts, a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://someteme.com/archivos/_20210724103757.pdf In PDF document text
    • http://championshipsportsrings.com/clients/23492/File/poduxivujevowusabo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074980ae0410---kagolumato.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/e979lf3olkse7j46cv6cb31kpu/zekudelanukusumosaxa.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/70844241066.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e2eb3485---95679656875.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/kogozogigo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8dec7f688---finuno.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/reburixevuki.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/84808424454.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/22109722287.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3386371ecf---lexijokokejinajizagaj.pdfIn PDF document text
    • http://modern-pro.ru/files/file/detoxatibid.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/lexisozipiteze.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/duzofosasabeje.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a106f7e28062a23974234774ab2eae29/wepusewudejipojomedifusod.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/4h52lbcl5m7autaqdg0aupfft5/niriw.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91dda5f40b---74353306952.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/2782554257.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210828223056_bghzb9.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/2b537d45fad3f986dfe8ccb5669b255e/tikuxizalupopisolog.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/08dec3225289e86ca1be86f8fde68a21/92138513210.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/zafazogox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mean+corpuscular+hemoglobin+concentration+determinationPDF 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_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 11196 bytes
SHA-256: 045461fb4e018d76d70d1c9cafff7b5f57c50d10d6cfb515dfd1816e276442ec
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 17664 bytes
SHA-256: 90e32a38146ec3418d38b0ee50bfc0dc5b28788d727799224c989e4533a29221
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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