Malicious PDF — malware analysis report

Static analysis result for SHA-256 67644f3abfcb00c5…

MALICIOUS

PDF

82.0 KB Created: 2021-07-08 00:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9528998d4ca6007c90211007b80735c1 SHA-1: f1c4588b0f3f1af6a8d4302429b1d0c85a1dfee5 SHA-256: 67644f3abfcb00c51d11026474aecbc784b14005dd12a8b1c0064d4873039cf3
164 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 uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oddluzanie.net/userfiles/file/20696462049.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dd6ca63cb1e4a5aca03d19dc6dbaa089/93194475909.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/77f51a0363980a1ac87f563a68237a3b/lanutinizama.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/37827803083.pdf
    • https://senhewood.com/d/files/wadiwubimazerinopenisij.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a70f1d3a---jenidefu.pdf
    • https://ludifrance.fr/userfiles/file/31153620306.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cb0e19c56---serururu.pdf
    • http://cp-1.ru/userfiles/files/pinunikelet.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/i0sc38aqmocfrsq9dhjrg9e4t2/34484478848.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53af574975---wipinatazo.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7hle0hupm5i8j3sfk4bqqjig76/fetazeja.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/898e77bf9428b07ccb10b985c1462163/buwinavage.pdf
    • http://newdimension.su/userfiles/file/rurif.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8c288f34---judugewokalaxorikokelos.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4c612b9e59ca4e879c0d507ef1408dae/525821639.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7mlg6usep8fa1r5p58dcdh5q75/jonunenes.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d3dec1c4---naluramunawapejoj.pdf
    • https://incoyun.com/calisma2/files/uploads/novureruru.pdf
    • https://greenfuturevietnam.com/Upload/files/74301258771.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0454a070a1---94984803251.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0b6fd4cb10518d3da1b1ecfdd2c9b054/wedutofojaweluninoranex.pdf
    • http://gazosilikatnn.ru/uploads/files/62172635885.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=convert+ms+document+to+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 16792 bytes
font_01_sfnt_off0000f721.bin
5af08bdd80107dd835a7a73856825166b0b20e8ceb6c2341ea61f461eb878ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 10680 bytes
font_02_sfnt_off00010fac.bin
90a83cdb4d9b678f61283cf181fb0d8bb7a5c186782a994ada55f6123d989f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 16560 bytes