Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd34f61e9e9b2f14…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 10:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcb90bf5a1398416032c58ddf7d44aff SHA-1: c82f48796ddab7f3ecbab49e27aeb133b4865ca3 SHA-256: bd34f61e9e9b2f147ebee779e787b3b27b9edc763e0e25307e47045a5d67bd7c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, and one directly to an IP address. These links likely serve as a lure to download further malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and URI heuristics strongly suggest a malicious intent to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a28d4f477d9---kevamukukosixi.pdf In PDF document text
    • http://kpghomerepairs.com/uploads/image/files/5172380673.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/rituxolovareniperisijan.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082017e150f2---65267422360.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80535569141.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/rujajarubijufij.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/luvajopozipakekapo.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/napusomawitiviba.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/sobukugotilivogix.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a55511c9e1000dd8bb09b6f5502ba83e/38521240229.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92112e17ec---mezisinetegimedon.pdfPDF link annotation
    • https://0286869143.com/editor_images/files/digaloluruvunojojoreko.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae947330179---vademejazusupul.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5470c4b4362a8b1bf23e48e0ddc16e4e/zelidovomavefavo.pdfIn PDF document text
    • http://sinners-party.de/media/file/pomujebapekomadixul.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110e96589916---6711229229.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/aca199b252032b9edcf678a6cf0b006e/mezodededa.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/zaroxegowaruxazine.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/94360278164.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/28446272458.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/p71hlobv4s0l0bloj6d0768a01/tudedimutolinodilajumupul.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/75131203336.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/tixonenisadusidunavawazuw.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/11134206550.pdfIn PDF document text
    • https://shibbirs.com/media/files/mukafefilotuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=paint+it+black+guitar+sheet+music+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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 17596 bytes
SHA-256: 41e7ff6c4d52f7ef53a853d0236a3805226b3cc6f9aab1d4ec70e97ae86e578e
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 11280 bytes
SHA-256: 1d071bcc2ba6f14a3e49c52a615e9bd2ddf5396b380fee803ba755edea863ab3
font_02_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1