Malicious PDF — malware analysis report

Static analysis result for SHA-256 98394af44c69c336…

MALICIOUS

PDF

89.0 KB Created: 2021-08-31 06:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26286b593797e42e2d22edf4729e5da4 SHA-1: 2e58df13df9009b97ffc2947bdf490462d42af89 SHA-256: 98394af44c69c336adf4538c97b613564560e414fbb3a264027d42467dd4b3ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://krisoc.ru/uplcv?utm_term=traffic+routing+in+wireless+networks+pdf PDF link annotation
    • http://brandnewgoods.net/userfiles/file/33272139425.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/kuvuxulezopitesulisezav.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/11958128988.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a720a0f9d---perebabot.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nakro3i7bqqs7i6ib9frivknm3/59313807979.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26246489985.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/07f0dd1349f6ebb2e4e8c5034498bb5c/ranakusisuxan.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/28faffb82287f2f3ee9f65b94111eb9e/nipulubadapakaxomofefi.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1627281041.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/aed02a9c8b601e91d7774bd999408eaf/livomuvololutuwo.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/184jo1550dbfeeu5qof56nd172/59899175307.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/degazawifun.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fd7071e4---93736336357.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210714_0A9DD97CEDEE8FCC.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/26056850372.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/37e223f5012602eae4edd26d1a63c519/61517864202.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf20a0c39b---wubiwewozakegijidemuwir.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/4575925708.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/68178871685.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/47745505575.pdfIn PDF document text
    • http://kelvista.lt/images/files/89130826957.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/37962912570.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/1j6sri5e0gt194fb7e5f2ikufm/fijumilixegebulefiwim.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210807030056.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/poxuwamasaviliba.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///desajizimupebiko.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_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 17604 bytes
SHA-256: 6d7338a56cb112ab23f7c25e0cb26cfbe94949a8100831a9c5b18741d6ec4b0f
font_01_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 11036 bytes
SHA-256: 8bec91e8b672f5a91c54fdaaea4337ce3020bcc4ac30ac11b3e20b03b9b056d3

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