Malicious PDF — malware analysis report

Static analysis result for SHA-256 2576ae78e862d520…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 14:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7851a0c9d4616df0b40013e1e97ed104 SHA-1: 063e7f4958134b3b6baaa68304fbe1d62e35b7c6 SHA-256: 2576ae78e862d520991e7f9685c88c6c362f43c124ca1bfbace52ddb35ee8ed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=james+clavell+tai+pan+pdf+download PDF link annotation
    • http://colescastle.com/clients/875019/File/30898839692.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/sujoliwoko.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099e13ce581c---zifesukigovebuteba.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/33233013313.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/57499884885.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/tilisofepi.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/fefijarese.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/63332145582.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/rakikojig.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/82031079442.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c28e76be---77461366690.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9579f31771---30309846862.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83672effd6---64076402675.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/32ae00c704e79d86cfaed7351cf6b88f/9374942193.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24105eea62---47343221225.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a88d650b85e428d2acadb4fd9f3fb60a/96709961188.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16095b210139a7---79151952728.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/64241019151.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160753e372da98---jedutixikavubenojezezesim.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/pewonarevokej.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/3189984013.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/35610120828.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/ruxitebilanikalom.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b360a66273c---12537672610.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/lizavubomov.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/dububiferasidebus.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_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 19388 bytes
SHA-256: d4ed0067f7e5517d0d1d894dd9b483fbe5ccb150f65cbb8e6f7078285077655e
font_01_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F8 10824 bytes
SHA-256: d37ae390c66f761c9a2a4c64105731ff160f387cc2a58f4c6183617f358046b7

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