Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c67d84c7f8e7b60…

MALICIOUS

PDF

93.8 KB Created: 2021-09-01 09:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 363d71d67267309aa331302154773edc SHA-1: 476e6cc7ba23e7b1fded3128a1d2f1499fa2eedf SHA-256: 9c67d84c7f8e7b60fc0773edbe44910eeb4290c3167955c0ed430500ad7ef9a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://deccanquest.com/konadnew/userfiles/file/vavon.pdf In PDF document text
    • http://alkanboya.com/files/file///bibivowuxaxigasas.pdfIn PDF document text
    • http://greenbrier101.com/userimages/5846400309.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/58147968510.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/70196389613.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ifspannbh270smalebgktbh821/30375350823.pdfIn PDF document text
    • http://zuche0551.com/upload/file/12983694485.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kenudolibud.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6d21c280---xorazojod.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/43127402595.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/88048798635.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d992c06c0e---17029151633.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/3186917487.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b46da5e9f83---63851787119.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d320d58---xumulezada.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/abup9vena8jj5v4vo4d26j12dq/zilemabereb.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/6715355e630d85c62d4e537df4cc3020/bigogipirugu.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/90381217281.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/57076382421.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f041d46b2b---74556554110.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/jemabudoris.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/68b092597309591bbc569938eed9b490/dukixuxagige.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/pesimuzumafexaduma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=i+want+to+play+euchrePDF link annotation
    • 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_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 18224 bytes
SHA-256: 27c4a53fd75ed54aae3c090ed6f92171fe9992ebfbca41ed7c3b4f53c376ecc0
font_02_sfnt_off00015283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15283 10464 bytes
SHA-256: 13ae6451cb1fd2c431781a9c7813ce39396f0151fdac2eead1406d81b103e553