Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2c80f5d02ee9ba…

MALICIOUS

PDF

100.9 KB Created: 2021-09-08 05:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fbadcfecf6c0a643df8272a98b4b3c8 SHA-1: dda6df6a09b2732dbb1c1e2985148a0452497bcf SHA-256: 8c2c80f5d02ee9ba862b6534586cbafcb807ab3648a84559bf9d3072f0016fac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of these elements, combined with ClamAV detection and ML classification, strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=scalars+and+vectors+class+11+notes+pdf PDF link annotation
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/80602110544.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7c02430353963775292caebe6142e9a0/14657088659.pdfIn PDF document text
    • http://laserinnsbruck.com/static/71055165138.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8c5487b23c4b0e159b452029dddd38a8/rovuda.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/zosiwusivubuloxazanew.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/kuwinenegoso.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/kifetejogadoderin.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9baa46cb70---sedokebiwinubarefudape.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/xikosixenupotefove.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b367ad70e1---ranopajikulesexomupefonig.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ade0cb10d61e7ed105e9b9a182f19750/ralexubovelemon.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/lexovenobinerepiloxed.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/57616405989.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51085335839.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/zegegiduritinizozisaj.pdfIn PDF document text
    • http://krzeptowski.pl/file/japagewimetasimulo.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/27993737198.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/lebuxugaxuworegak.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f9394e031---3277344492.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/gemanujajaxumif.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7573cb010---38065116846.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/20810480586.pdfIn PDF document text
    • https://yorapp.it/file/5136285631.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1c2on5qm47975pg5ue9hrjut8l/66091652719.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_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 21544 bytes
SHA-256: e93bf8448817b3f5fedc51edefc6e2048ee41c1dc21f3731adf14bd50fe69ef5
font_01_sfnt_off00015474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15474 10712 bytes
SHA-256: c2c884c6b0127031430515d0188a064e074cf8fdae800acb12322c02b6d6039e
font_02_sfnt_off00016d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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