Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aecb18dbc1ba7a2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 18:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 568c66da89558969aa28dc38eca9183a SHA-1: 8a1f214f2e5a382a40c5d0dd96a10a059fe7a361 SHA-256: 7aecb18dbc1ba7a246bc2dacc628cb68d00b571c520855b895b0533c769dd789
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user engagement or categorize traffic, common in phishing or spam campaigns. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://nomylo.ru/uplcv?utm_term=gangsta+books+pdf PDF link annotation
    • http://arniestribu.com/campannas/file/41237939600.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f0691f8c3f5b6fb0984c6c019dba6af2/bumadexuludozore.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/25641420524.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/14787712553.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/jamaxo.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/62225718256.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/41396351797.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/55161993020.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/banog.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/14460585919.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/sididatuwojil.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/8494883828.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e3ecd46e7cb1a0e4de72a9b2246badc6/56802442096.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/penusigefusigategezed.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/54463287761.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/mijosa.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/lijapawotexasofu.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ce3e26aa9f423c3b178fea89998e0235/88175631795.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f89167c6---susoladawav.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccea821b4f6---46172385631.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/lolonuguvitomepubibuped.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f958346cc---54577953225.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608773f4e2f49---55709604275.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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 10576 bytes
SHA-256: 721f7a5eb7629acb07a3e7c37b89c10e99a3e48e5aacb03dfdd7af4ebf38de8d
font_02_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 19292 bytes
SHA-256: 7368c6d5f90fa8b438555efddd4e78411c37374d9d60ac93e4d6d62615e7db32

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