Malicious PDF — malware analysis report

Static analysis result for SHA-256 e848bed940919847…

MALICIOUS

PDF

109.5 KB Created: 2021-09-05 02:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cd0067b8d9994269f9e7ae09463a2af SHA-1: 5f649b4891ac1c048909a17cddfec610a5dcdfce SHA-256: e848bed940919847cbeb33812d8c2ce6c438ac4d08ec6520bc2f52ca732bcbdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous URLs pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to distribute malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://adesso-moosburg.de/images/file/77476473715.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5beee3a950---navakaritoturinuvab.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c930705fa5c---judurivamisarese.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b684e429b---bulaxazitewodedaxepu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b01bea204---66469528574.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/aa1f459e5100def47448df58b9605ca8/74774173454.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/kufodir.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160865ec91f337---45936943744.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210618014103.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b887f82df89---popudemo.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/28576941857.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105472e24917---gexowosusowujaditod.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5e2c3fc28---81512542236.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/88bdfec299bf35d6c2cb3f1b35c979ed/naporisesuzemazutaduv.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db34320dd9---46075453331.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/tedonelujenemox.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/54048f47915c130747e0e7d3929d548a/wekubepilegule.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab68b87705---45018246335.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/25868199261.pdfIn PDF document text
    • https://123natura.com/stockages/files/keruruxanizu.pdfIn PDF document text
    • https://aildf.in/userfiles/file/zigetidojawesoluwanejax.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021071304302280554.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/35845931633.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///sinazavusodixaferubato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=arabian+nights+original+book+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_off00013f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 21764 bytes
SHA-256: bca626afa2ed339a1896ce37690fd71a79cbab185d4e0fbbe80a2396b624845f
font_01_sfnt_off0001774b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1774B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F62 10860 bytes
SHA-256: d25cdac4eb8be0b31fdc0acc1960fb68404963d4de19fdd3c405c676c2d7cfb4

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