Malicious PDF — malware analysis report

Static analysis result for SHA-256 825c1b9e6da7469f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 10:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3449250198cf9c898e7aa928aa6facc SHA-1: 6083a2766d09badf3f9aa729273458f9b21eaf72 SHA-256: 825c1b9e6da7469f8e8527b33b22eda08df6eeb02353bc556571cfe200177dcc
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm on disposable hosting further supports its use in malicious activities.

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 https://archism.ru/uplcv?utm_term=lattice+method+of+multiplication+pdf PDF link annotation
    • http://1careglobal.com/upload/files/95560803741.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1886b85c8---83354013297.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7d36fb14---wazulagowaso.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/49d7f4eff95e2d1ded1b4e8804968321/xusatajenuwi.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210907212201.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a99715308ab---gowamezuzuzoxinig.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/22387951205.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/takn1b30scbi0apt5rl7d4fhkn/6458505705.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/98218653764.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/lizuposiduletadobijakabas.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/dagotasozixatufuxefulo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082b19509e6e---34272432789.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/10227079210.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/82246732365.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a5c8e91f---72594977701.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/293aa45fb9561ffcabed7ae5917cb82f/budun.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/regedejamanizalipogivutid.pdfIn PDF document text
    • http://atiksigorta.com/files/rimonevisamu.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f69c577a05106bd7d15f10928751263f/gemuruviruf.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/wejupizazikik.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/kurujuzatufepowukun.pdfIn PDF document text
    • http://boxethai38.com/upload/file/watogisobako.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/28517401011.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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 17324 bytes
SHA-256: 0657edc56453aa6f927e5fb67b25519d488e226ad24b85511622c5403d71edfe
font_02_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 10672 bytes
SHA-256: bdb5258887af902c9c5e82ba6ba1db0ff0d4ac94130a35747d264e688fa36755

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