Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc7a5a6248283e8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 02:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc28a48a65459d9233b4cd0e4aba9f3f SHA-1: d15af1d1e01ba349e4bd2553244eb0f7bf0e1972 SHA-256: 7dc7a5a6248283e888b61fa85cb884cebb3d5718f8725876fee34893a0bd3c5d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farms, many hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=sao+side+characters PDF link annotation
    • http://myucpb.net/userfiles/file/70526281962.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fixikopelexojagikari.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/18331496419.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/63081708433.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/41634310967.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/50175725279.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da345e2aa5---52472683924.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/14047950808.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/luxigotowetezubamoxa.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/dojifugafejovanarin.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/70m3rtbind30tgtsnqmicksjpi/vatuxazu.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/28069831241.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/figadikonogasifexuxatut.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395df62f959---68386115646.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/46750490849.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/sovexo.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/38184662215.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/zafapazozirozojoda.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906210824.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/zarojoj.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/40844375055.pdfIn PDF document text
    • https://mlspoland.co/files/file/pobikijev.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/27237025434.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_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 19536 bytes
SHA-256: 09aa2d22a282cfbc4fd22a0f3a802d409d9c697c77a91f7f6b05da3f1e931290
font_02_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 10392 bytes
SHA-256: 49ed3dc7e89b2ace563dae56f5200ce7240d0e74fc63fcd35eb34097926dc140