Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f23a6c50f5937ae…

MALICIOUS

PDF

90.4 KB Created: 2021-07-16 13:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 878eefd796bf1b9f7da7cb904e15ce20 SHA-1: 2054f720ecf881ccb2507fa175c2218dfb745ea4 SHA-256: 9f23a6c50f5937ae6a885cf7e10555516b91e7a28bbcef5768875bf17c5c2a36
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of these links and the overall structure strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=cheat+codes+for+robux PDF link annotation
    • https://bombapin.com/calisma2/files/uploads/14126840336.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/81725933836.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/tct9mchtn4c2k1s3hockb2vc1b/vusopa.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///janojakubuwibefukajujitin.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbf31e4c7---96789988118.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9854239be---96632290916.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abd06b20eca---99987317896.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/qbntijlako4d1umghk31hhikkh/doborilutopesutubaruxi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc379a4e21---buvovu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d945ad23---jetiratevipofel.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/eb0ece031c88be986f0d4d45f19cb2ba/73629691241.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/49362125953.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1352757c3---zixufabejazavokojenamat.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/sazojonovegi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/rvcu7gpm1hhhfl6vnsmaj0tia3/60984500116.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bemevamarewunere.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b57cac6b---wozuda.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8ca6d90abab9e295b640e6cfc54bf789/wiwukokuva.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/e937rck7oigc11hs2b8ur99s5g/boziritujalusomiduguz.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adcbc61371---48152249695.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/69101522128.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160916db554cc7---95529756805.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7738806db6e19f6076bf3d0ed7f38e66/dupetu.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_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 10704 bytes
SHA-256: 2ca00b398f15de27109135538288ef3068175cd8668ce184f797dc49b433ddf4
font_01_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 16952 bytes
SHA-256: b74c34154c0fde15ca07efcf79359e58011f89bcd34615e6bdd3e21209190643
font_02_sfnt_off0001448d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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