Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c21944ca6fd0a0…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 03:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9738721775215395f96b51e27b2fd091 SHA-1: 021e07ef404e19db49ce5d3648f48be3dc92373f SHA-256: c3c21944ca6fd0a024cfc34179e64b26f5c36f64d7087d07468d7bf457b6732f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites hosting PDF files. This behavior is indicative of a link farm used to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d944b75ee8---segazi.pdf In PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdffa672d---letuzen.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9ded35503---79066259620.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae225009a3---tivafovelevaposuj.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210516085828113.pdfIn PDF document text
    • http://jp-cable.com/d/files/82471348732.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/23822339856.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6933344857cdd1ce6b440d2e242cdc7/fawarizur.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59017d22b---patanumusare.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/33135514405.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/malotevebotavolevovejozuv.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e448d26ccb---59498641184.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/28517453383.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/telodoginiwokexukimobatel.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/tkgnpc0ssb87env2no7nenvfbb/58623384838.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/12454010961.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n5t2gd9sb31fhst9sr0fedb1jl/miwufidonekejukag.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1a1922bb7cb26198203ec27db2ab4192/bifulisowoded.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/b3dc2d1fd9543daf560a1c70c9bc67cf/rumanaxexuxawarixebesu.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/33171800840.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ea42a10fbda18bce3de836f659b0b343/vobexolaz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc2768f213---66195808514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=class+c+subnetting+examplesPDF 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_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 10868 bytes
SHA-256: 26ca2fd4f87766c3746032d5f5e362ba7e4ceef78f46ad7b1544119c0ead79e0
font_02_sfnt_off00012ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 16868 bytes
SHA-256: f32728124f98f47ad70e4964529e47c3fbf7d7c44cbef65e9999b3e4e03c2f31

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