Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd6b7d7df28fea3…

MALICIOUS

PDF

88.9 KB Created: 2021-09-16 12:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 891be889627e0e93151320e9d4c502fa SHA-1: 2c11e72f7ddb34a4cfe67732cd00d80af267d327 SHA-256: 3bd6b7d7df28fea34db8dbbcff47a2fa324324e5d89b45f7fc4ded3358db90c8
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for malicious redirection. The ML classifier strongly flagged this PDF as malicious. The presence of urgency lures suggests a phishing attempt to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=shield+hotspot+vpn+apk PDF link annotation
    • http://archissimo.eu/userfiles/files/61597893734.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01b36d10d---69204046559.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/34932355643.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/lagasananugedapotifi.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/gotupotubijateje.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/127ubjcbsta558fafjg6brtn30/sinupejerejevarinaraxemaf.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/48661805919.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/difomebiwesirezudug.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/35448832112.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/binapakobagu.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/85761432571.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/64277832939.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/14930378984.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/72013737801.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec45c58c4---wevogatutavuzikilizewuliv.pdfIn PDF document text
    • https://eguiders.com/uploads/tukomarel.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/vijebiwerunavopipigodigag.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/nuvigelule.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/zejoxifer.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/sawunalokapuledukera.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161360a666751e---83442311585.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9100124160.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/pidubakol.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/81536023512.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613985eea3445---96137081529.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_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 21904 bytes
SHA-256: e9ee412648bea346e838844ed9f6724db01e3f5e010207031fbd99ac93abea30
font_02_sfnt_off00013d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D89 10624 bytes
SHA-256: 3c23cdf3459fe47e0e9ab2f176a49b0a4b1cdf12af5a6aeb573b566745964388

Open this report in the interactive analyzer, or submit your own file for analysis.