Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e8e6cba0eebf57…

MALICIOUS

PDF

95.4 KB Created: 2021-08-04 13:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b941c814d3f5f51747c8c193f4057061 SHA-1: 692d7b4a09c236f3bc151d3709d00366ce00f777 SHA-256: d8e8e6cba0eebf577d33328153042678201f4ffa64767580a183d21dafef4522
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's designed to redirect users to potentially malicious sites. The document body is unreadable, but the presence of many URLs strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=how+to+fix+shotgun+trap+rust PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/o28gukqosfg2j92qvribvqbt8a/vazan.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/tovakupusifukirutisozuso.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kenisitixetudejejapalu.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/fosisatusawimagomiwu.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/91960951895.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/22ebb378d2ff06f7b6780ce86b654e73/15626441238.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/losij.pdfIn PDF document text
    • http://rapet.hu/files/kidewisufotesuno.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3bcdda5e0dfdb4048673faf37805a784/50125722488.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea69b2bd85---verigoginemasotikip.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/196d931472ade36eaa88195cc72bf1cf/8107052022.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/27663851769.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b626b163469a4227ce8f9d8ff0040140/valadovaduzofubiwavew.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512060857344819.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/winosajirogitadifivo.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/safigesetugikupejivadob.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ac5823feb12a20c5c301c71131398004/96589412858.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce79156db5f---tarekedafedosepow.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d52c1e45c19---tosanatiliboxogazow.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a084c11930e---runeze.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/47d4fg3tc82n192ki52ss6sdlj/41149854798.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/wugudetodonazolisisapived.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f7af796546a843cd364031b044a5f170/gifesebamixi.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_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 10736 bytes
SHA-256: 8de2abe55215b01a6e6eba1a4706faf294d3560a6862f13473bca495eb27a15a
font_02_sfnt_off00013d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D22 18708 bytes
SHA-256: d531e90795d87d5892920ab51c0b1532d6a78fea3243f6a607188fc57ef0cc2e

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