Malicious PDF — malware analysis report

Static analysis result for SHA-256 93af162f0a9272cd…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 20:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 973560cfcc9c790f16645f61eb20fb00 SHA-1: f2705170c32f62b67143249c0a395187ad9260d6 SHA-256: 93af162f0a9272cd4458f0810f51bd621b157cf2b6f0b34c62240bee77473970
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to external sites. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=sfondi+belli+per+android PDF link annotation
    • https://pielinks.com/UserFiles/file/nabebakezedasokama.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/mexevidagusega.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/28612626126.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/mokawewe.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/jowifuwovadeveviwaxa.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/buzezubimazamof.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a7aab23e---wipazikagozasutaj.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/91511666401.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/52794418209.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/jibalixinemevemamodosis.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/moxoxid.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/12763378973.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/8606568891.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/61918774138.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/likagabulolog.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/vabirulinipituroxuni.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/18531834187.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/sasimamopudaposudusa.pdfIn PDF document text
    • https://stvorki.ru/files/file/47562845336.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210902075304.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144b0dd267ad---musoxofemepago.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/18904216903.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/dosebim.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/jegasuzaxadev.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0d49e8a4---40108726795.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/lerozekuniwax.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/povip.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/nasemogowasiga.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_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 17580 bytes
SHA-256: fd6b8632f9c9511011aeaf41f550a33256b2b82739b58f1b6457a205d159fe0c
font_01_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 10440 bytes
SHA-256: 024302de9998f6544513d65866e9f196af3605d2550f23fcc20a255733ff870d

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