Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c5c15166a643f8…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 16:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3f2ca7dab6a65b75703b584d1c4fcb7 SHA-1: 12a2054d8e6addd1cc524baccfd1114745ce445f SHA-256: 86c5c15166a643f83e1fb99df691199cef776d07cdc98b5d51e123fe3ff1d056
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://abovomedia.hu/_user/file/fozafisa.pdf
    • http://www.ecvbrass.ch/user/web/file/nexika.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/743062ae8d0ccc3c08f5734015c460fa/35001711186.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd63f50da9---kexawuwigusosiz.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a86868e08---26244882457.pdf
    • http://gtlmarinefuel.com/userfiles/file/gejazixiwukepedemi.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160719f62b4297---33067056587.pdf
    • http://moyamoya.center/images/hand_uploaded/files/32142898068.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b592864300d0d5d3eb19d0c5ab77cc0d/88002349332.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/di35tu51udc383qo0molc4a1p4/22011453897.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/46a2e9fc6aeadd7d61c60022d61e3ace/sudazukepol.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9ao77il06kkv1g8jbghma45f74/53798014531.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/no50b368uo26386p60q53tnf46/besiwozarox.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f6b5a955---1040431546.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ee45bef2cc0a29a760dcddc6bf3704ef/bavofidamoxokifu.pdf
    • http://zuche0551.com/upload/file/11943467728.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0ppc2kf20khedm8aq260bqn231/pivixezewokadadinefowu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160720e0653293---fimajuwemujifizifazax.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1208aac2ef---doriparabadixukizokozo.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd49592b47---2567656248.pdf
    • http://danieldesignpro.com/userfiles/gixufatafaz.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/tasojexanamibefari.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/60868086590.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=muffler+replacement+cost
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16792 bytes
font_01_sfnt_off000107d5.bin
ef004adf4e797e9fa1c90354022a8d2f94e4145aee960e637b24382edb37b85d
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 17336 bytes
font_02_sfnt_off000134b4.bin
1bf04e62fcaf05a300ef6a8f876fdea3655886f01abfb15cb597f8beddcc6403
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 10644 bytes