Malicious PDF — malware analysis report

Static analysis result for SHA-256 d308992a0bc2eea9…

MALICIOUS

PDF

96.6 KB Created: 2021-06-26 12:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 65b20da7fd89739d34a3b3e1dda06665 SHA-1: 377a49ef2fa8a0f341e8d9bd2587b306106c880a SHA-256: d308992a0bc2eea9ebfb640ef450948acbde65c6be344806484efd3b9c0bdec2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution lure. The 'SE_INVOICE_LURE' heuristic indicates the content is likely designed to trick users into downloading a malicious file. While no scripts were explicitly extracted, the presence of multiple external URIs and the ML classifier's high confidence score point towards malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://allytemp.ru/uplcv?utm_term=accounts+class+12+chapter+1+notes+pdf PDF link annotation
    • http://brenno-tojestto.pl/userfiles/file/55117489900.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d251951317---33204510574.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6c060152---xokite.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/23167170479.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b03662e89630b7c8d0775a59334612bc/bulurajemujibududewewevi.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/48362081400.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b193f2bd7---furemagekisononaze.pdfIn PDF document text
    • https://sce.tw/uploads/files/60cd6ba0b88b9.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe943813d3---jurix.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/suwifapen.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083a63fef836---pujamilozovame.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/50299697031.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/p62dmf958pk151sb0nt63obs1l/76448560425.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d447336b---dededa.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e8f4708f---83868028650.pdfIn PDF document text
    • https://micsys.in/userfiles/file/jisekiriweloratanofunakap.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/tatetubizewoguwemido.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c62bac8a498---dotenixajafovokiwabu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf20872f9e---wopuzadajosusadufisimi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e9014872afd2b071023f7a4958e732ca/95068246777.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c8db2983---rijijamuzovaj.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/81605950116.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5516e4561ba1f5a4b318477784835704/fivopaz.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_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 18320 bytes
SHA-256: 4ec670289fe263a6737bc38f88decec3550c41539334a3726c182ab4fb4736f7
font_01_sfnt_off000141ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FF 10876 bytes
SHA-256: 4efabf62295b2d1e8ef7dd48fff9a45e54133a20543393e727bb26e0f3b2a636
font_02_sfnt_off00015b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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