Malicious PDF — malware analysis report

Static analysis result for SHA-256 38648ec0abd644e7…

MALICIOUS

PDF

87.8 KB Created: 2021-07-16 14:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2bcfe04f209afc78c66bb2ee37ac7eb SHA-1: cabbea706a792f8c6adcdf268584dce907cee483 SHA-256: 38648ec0abd644e7e6f7a370b52991ce2658ac0433ec18db7901139aad795b06
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=have+you+been+baptized+in+the+holy+spirit PDF link annotation
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wifuvoforulawiremovuj.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803e253a2f7---kenularudob.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/62145470463.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e06895ff14f4fdf88e06264180f9fe98/43076233068.pdfIn PDF document text
    • https://t2sc.me/userfiles/1179083741.pdfIn PDF document text
    • http://hitoduma-d.com/files/files/lunagisenodofizixali.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tuzixened.pdfIn PDF document text
    • http://4bx.pl/public/file/sedubagegigulovo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2360993872---23889896415.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d5620772---finaguzejeketovoda.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/mukigijitawufakuvobukusa.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abad8499d2d---kozejexafefilupipamopub.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/79444954489.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/64735519980.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/naboborilowo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fdl5mkg6721vo4ip6n7k4da545/67550100409.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/rukugidabamalazaluxesewin.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/nodiwejeruzakopuguxipok.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/18916145907.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/61454a281d0110f94da90cd895ccbf9d/92955641864.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/98685104048.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75913b2f97---guwawopewuxowimuxiwixop.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0ef8299916949a9892569effb7a6df8c/43185852.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_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 16472 bytes
SHA-256: bf8cb509b41a3db0001f01704b8362cc16b927b5f9f72b211edfeb1da8846f43
font_02_sfnt_off000138dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DD 10960 bytes
SHA-256: 4c8097537dec8508b03e318956427825440f9ed65e8a419ab8e7fd7bc1276e59

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