Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6dbac2f621b614…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 20:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 458572f4338d455e85b20d528c4dd633 SHA-1: c1cb0155505afd922bb1fe1b8a130bba837b8ee9 SHA-256: df6dbac2f621b61436f6cfc6fb4efa177591b42da73952f5cb8441a12bf0b305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, many hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=android+battery+voltage PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161304b58041ab---ropet.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pixuvolas.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/lorim.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305aced8d05---17753517162.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/75857162685.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce516e663---mebitesonurun.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613671f910d0b---93556110483.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/65885181501.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210904_F20A7581646354D6.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/29844337273.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/numilukaw.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/82088755976.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/5758553106.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/9096949919.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/41604001839.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/lekekonixevefagivobavazem.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/88727804486.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/64534715584.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d59cac83f90a874dc54f227876d2e293/71090729811.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/mukemapupa.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/levozilujipadezorisej.pdfIn PDF document text
    • https://bselink.com/userfiles/file/toserorajumeb.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613137f3bdbf4---27161831815.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/zukenimabuvemuv.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/mujilo.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/82071517123.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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 18232 bytes
SHA-256: f733cc94c58481070fdb735a7b9ae7485e90543a22552b24234be9108d3d671a
font_01_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001363f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363F 10556 bytes
SHA-256: 9288fe92611eb290c53f74c9eff7f83d729654a56b9d40b6576171c9670a6818

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