Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76ce2b4605975dc…

MALICIOUS

PDF

83.6 KB Created: 2021-08-16 20:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2b3170d14deb928c77e60f135454f13 SHA-1: 8d921b7bd1895a2d919755aebc1846582eeff756 SHA-256: d76ce2b4605975dc4b2f52375d6e6ff4f6cf9c0a9f9f9d9587449b9d152aa53c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ded531e0dd---38927860521.pdf
    • http://mikailang.net/userfiles/file/20210511095338_1267856552.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed208b25a7574bd21feff731c139d882/viwasudamugilepekosesalek.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/vte699epu731s5hno6p5ge2mag/gorujatezokor.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/45261915826.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ec275dfa---lugomupenegusuval.pdf
    • http://www.pranabkumar.com/fckimages/file/furukitarulup.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b73774449c7---74801455125.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078cad0e4f1f---xezoroze.pdf
    • http://dopuskvsro.ru/UserFiles/periz.pdf
    • http://syarmarka.ru/userfiles/files/78204958866.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c705b3c4c56---95691205954.pdf
    • http://apexibd.com/uploads/fck_uploads/file/11090878631.pdf
    • http://vimbark.sk/editor_uploads/files/vozumexotolixewog.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0476dcfd9---5166239224.pdf
    • http://historia-bfured.hu/userfiles/file/limusamotebakapudogazex.pdf
    • http://www.sanjuktabanerjee.com/fckimages/file/biwupibuzef.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/wupafiku.pdf
    • http://teakdeck.pl/files/file/nesakojenavisapimunisibap.pdf
    • http://parkhighclassof60.com/clients/871169/File/67121338053.pdf
    • https://speculatio.in/ci/userfiles/files/mebusolalibujoliwewoj.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/dee7d86cadf1f140230784a25b0063c7/werali.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f07411950a562913c6f3a079b2ea4462/57596302548.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+driving+lessons+do+you+need+for+an+automatic+car
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 16792 bytes
font_01_sfnt_off0000fccc.bin
613fccfb5bc1010818c4387169652ccf23e39691e3fe684e8018b64b646c0f38
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 16008 bytes
font_02_sfnt_off00012635.bin
0afa8c6b2c2b0cab315e605608d98937aef79fe182bbf0b7c3117e5e630db109
pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 11176 bytes