Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d35c3308393bcf4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 19:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64a3fc03edae485ae00b3f90e0865407 SHA-1: 8aa5cdec10073bfd814d0bc5a07642f6bbbcedd3 SHA-256: 0d35c3308393bcf4ad136beb6a7a88aab3bba9ec5c4ea2fe850b257db43fa1b6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the presence of multiple external links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=stacked+bar+chart+android PDF link annotation
    • http://www.jindatunnel.com/up_files/file/vaxinubixawi.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/neximabimifamadikow.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/48324555041.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/79322937152.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/31673013404.pdfIn PDF document text
    • http://d-innovation.com/upload/files/19970821416.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8c73cfd0---wijidadefeduxareviram.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7741b5d332a53987074f1db0e28b4b9a/20576813059.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/42923007187.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/nipexesuvar.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/18749999051.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/56a3573596a1da36d8ab9c694c6e6efe/30491667276.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/36219493876.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cabe283d00---76860799770.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/15279203033.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cf71d5ba0b758a6f2ecaccd517bc23b3/86236288220.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rprqqo72js86up9jdbsrq2cc6a/robeniresameduditam.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/83467248693.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wuvizavakewuvo.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/jivijunagigopajesabuj.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630969036.pdfIn PDF document text
    • http://savemaxint.com/files/file/56119463674.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/dunomoselozuvu.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/89165905189.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/zukowenadezisakafosefux.pdfIn PDF document text
    • 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_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 10560 bytes
SHA-256: 5be82fca3afe54943e507adf1767f86a4f1791f9a717e8db2d1e63926e7b7c90
font_02_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 17508 bytes
SHA-256: cdc3fac74f7debcf828da97e5c24224928519bcf87670f0f064805bbf36ea273