Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd9c6542cb052b9…

MALICIOUS

PDF

99.3 KB Created: 2021-07-02 13:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c7c7678d0c635f267091b54b371f5aca SHA-1: 84dcabdc1b0e6424c51c2f89b34b066b26e79811 SHA-256: ddd9c6542cb052b9d5dabda5bf8430eaba99d4120c63b7bcb11890f987bf86e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate that the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://maciejabramowicz.pl/upload/files/file/12446585632.pdf In PDF document text
    • https://triosms.com/userfiles/file/judagosojidavadakajitu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091a72803fd6---16139474907.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4qfa7jig4tbdcnmtlksfq84uug/pesugexijigimudajex.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0530df1e6ee7ad9a4fb40433533e50d1/jerakelutopunibuside.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d39kea9dpt4107ve8c5cb8hr47/6182667748.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2299eba03---gimufefevepo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb068e21678---gatodovip.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/xefovusirojedosuvo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd92fd77697---61106679915.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/i03mmbhop9d1e6qmolbme8vtu8/48845515709.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608459478629f---72385814719.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/tpp6p6i40boott45s1ka9otab6/temarukivojoratu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53d9d461f6---89085747410.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gi73gkomosjg9ksmi7e1d4o342/85866711452.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0a9ad47dde353f1e4caad2ae7db5c3dd/21366398196.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/81934304097.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48f05169bf---62876287549.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/novofu.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/rifugezuzifune.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fobib.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/47143960444.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609642f7c7c38---jegomuzasudarazuvonar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+do+you+cite+a+pdf+in+apa+without+authorPDF 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_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 17476 bytes
SHA-256: 68e9d153baf1c33c105c57a4bdc0b2e093628cfa1b3ee63a6d19810361a08348
font_01_sfnt_off00014ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FC 10796 bytes
SHA-256: bd03786ac34c50bf9bbd32b3dc4cdb27e6b2f17ee6041f5a52fb467a257f9dc5

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