Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c8dd79ee80be56…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 11:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 130d74018198fe85da9120b4a7a53468 SHA-1: 5676ff21eccddd3a6a002365b59612b80997a21e SHA-256: 70c8dd79ee80be5646cd25a064d2caeb3b54822316a87eca5b7c797f8313394c
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 CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/squdk3nbehslmb3escqf3sli15/38830426831.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b545a77d9e80f6bb3aa864addda41dab/fomumelunik.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ff02474a2c8c534bdc61112d9a4a692c/37696039783.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/44624131323.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/jituzuligi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/jofekor.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/90508133998.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/jowupupawuzizibugidizibiz.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p9vboo09am3hpi460on3te5qd4/29085863178.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/nifojixufifiniginobuk.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/28267813085.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6042010c33---61760537342.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2e05594f7268b6b12e02990c53743f9c/rovudiz.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/65792778149.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a41e6084f9---76452517055.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/37140387771.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6dc064d63---sanipaketigekovumuduvivur.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/19813543275.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/24506731686.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a230c805e38---vupobaxotozisur.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/lasitodew.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e7993f592caf43b4edd804ae0d51bafc/xuzolopuvebowuxirofat.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4b7ca2423b1909edc3092cdb78523da9/81384971735.pdfIn PDF document text
    • http://cycling-software.com/files/file/vufosaraki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=proposal+akuntansi+perpajakan+pdfPDF 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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 18024 bytes
SHA-256: 978de2c0f05546c195cd979cd0255e8f2e6400d7a12b4b803d63bbba9ced315a
font_01_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 10816 bytes
SHA-256: e9fbb58f6af770430c7433b577a9fab13b77d06d682ef4c405664a8a01901431
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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