Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f33c9c147bf531d…

MALICIOUS

PDF

78.6 KB Created: 2021-08-27 02:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c06b1ca8d8a902f40e0fd1202ebb4ef SHA-1: bc0d5a64fd25c519ca47e845f73c622ac64d3ecb SHA-256: 5f33c9c147bf531d8057fc63f98d35dd25e06002a3532617eeecdab90cf477e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://laborke.ru/uplcv?utm_term=tinkers+construct+silk+touch PDF link annotation
    • http://expertsystemgroup.com/file_media/file_image/file/53150694558.pdfIn PDF document text
    • https://ebooksweb.net/files/file/dosonosedewanakelapapuxa.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a966ca06---25464076964.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/62700360694.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7498f59a57878c94f447e5c1c538f103/11500491786.pdfIn PDF document text
    • http://cga82.com/admin/File/xulawebumisamode.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16080a65d12a6a---32766992792.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/pevexekuxutifaxuvufesuzin.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/31841707234.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/wipapajalavimavupeg.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/zunufewaxudewibumubu.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/47290526199.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/ditodavimukobin.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/debosajikixazurun.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5fda389c---53156652432.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c020e220---56677037465.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902e8fce9a5---9433504788.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf314f970---nometuzevulabotuze.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134bb792060.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/41381244722.pdfIn PDF document text
    • https://starbox.fr/img/files/kurovafirixok.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_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 17132 bytes
SHA-256: 7cf2f94a38f51670eff71c821dcaf84df6cfad6df832a25fd20977c49a9f216d
font_02_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 10320 bytes
SHA-256: a540bba721e752edea3b5bd1226548b165b416c1282093403dacbe66949fa443

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