Malicious PDF — malware analysis report

Static analysis result for SHA-256 939507ef91bc2c31…

MALICIOUS

PDF

98.2 KB Created: 2021-07-14 05:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6dd95e35483e66bd013764a5823da364 SHA-1: 086166170d75944e0033db6a3d432c02143353f7 SHA-256: 939507ef91bc2c3119f898bbe8b0d3e0117a36daec8b0c42d08f8d8c0e693057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these linked sites. No scripts were extracted, but the structure and URL analysis point to a malicious link aggregation pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9712

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://samtle.net/ckupload/files/nuvoxa.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea26d7c49a---51913777582.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8f1dc4fd---didebudetoz.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/dedomedisezi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad6b40f79---98990584470.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e53de9091---89981467874.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102d0586ac---23569355312.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d15d76d965---56364913849.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pirikunediwefogot.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/a9519fea25d110c61101155f4f1ef651/jobexitifupibaxeruzibug.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f5c719949---52418339087.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1798052e88---januwilabonujovogobub.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/31bfae726cd0f3958eaba116e83fcf83/murupuvoj.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160808b7e016e5---tezaratixu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ts7ur22vm9knnd2f7j8kvr05l1/nakejexewag.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/2078557427.pdfIn PDF document text
    • https://baptistfriends.org/media/14436645644.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/61915018944.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872936ca380---zokogasipi.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/batirifexokisedoputobegek.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df128ed8118---mofalabowoguwoku.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/52f141ab13ca4260cbf9c7d2283dbb41/28909177190.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fufenonifivurinuso.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/bexumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+meaning+of+voluntaryPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 23596 bytes
SHA-256: 04bcda338548d8e851977a6cf805fc01cb2bc57e2d7fac501536819e4e3ea32b
font_01_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 3368 bytes
SHA-256: 2dc5ce14d85658cbbb18913c3c4624b1e3449488ce5112c02a3911b8cea33b7b
font_02_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 10736 bytes
SHA-256: 0df4cf31cbaa9dd0f4ed8de18db2b35dace6444b08e249fef1020ab80622ef2b
font_03_sfnt_off0001470c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470C 17276 bytes
SHA-256: 8551b2e797117072544ac532a69e5d581e5de49b1c6467cc9f1bee312d4befb1
font_04_sfnt_off000160fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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