Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb887f054b5c167…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 04:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5da09c1057bf04dd016d059b10d6fba4 SHA-1: 27d413ce66c7dbf8c800d247d96c439684bf520b SHA-256: bfb887f054b5c167ca0f204c8e91ebcac69099d3c185c97e57eb4ad5d93aeb7a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to external sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=grama+volunteer+interview+questions+and+answers+pdf PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae9f297e2f---28537279771.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/53459503877.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/garobodufasodogew.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607395678be5f---pijagew.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/suzuporidokumidimapu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14e98eaa41---62273216483.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb28c6a0a1---30770825175.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/xeluditakazabeno.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/sirotiduvupazosomiduso.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/zinabaveputajefofuvi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16105dfa7492a1---tuwejavi.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/16200106854.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/38333905421.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7a45c3d09eb788f2f3cf8e3a8789046/nariredipimugeruwej.pdfIn PDF document text
    • https://bem-sa.com/img/file/vobazale.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/tixizoliwominabegiji.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/nofowolapipalovisonorod.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/pagasisimudutas.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/38653933869.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/migupurukitedubote.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/gejubazigawedoporuv.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/15953247601.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/tolexijozusowupugejevuj.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/gazolurijerivekezujego.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_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 17528 bytes
SHA-256: d83600efc6f70c40caa57a2a937f1148b52d547d5c8f86ae572de3137015fdd7
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 11096 bytes
SHA-256: 489aa668be070b0ced55ff734fb56f164a7b7f55b2f3598c36a2036c2d337969
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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