Malicious PDF — malware analysis report

Static analysis result for SHA-256 699a62daa328e0da…

MALICIOUS

PDF

84.2 KB Created: 2021-08-13 04:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aefd04e70997e64e51a280d9efcfa1a5 SHA-1: 0eae1457961bb914cb265f74884bf285c50ea871 SHA-256: 699a62daa328e0da49b3b456b1dbbc566c5f5d8bbe976e7893e42f4a67153e4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=1.1.2+answer+key PDF link annotation
    • http://www.macrolepidoptera.hu/userfiles/files/tuwibajogomalinisagi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f51276013---32126461334.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/vafuladev.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7dfe66c07---vomalilidizabisolisi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rgocdlnpoqmqo0qtbaqovd3i6p/16663860378.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/8soursbfhoajtoi5f4cjo5so05/72091881719.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32ddcaa687---jofigigojevaluvofo.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/rufor.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/29048184999.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160798b89395e6---14703785304.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079474617de3---47673189431.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9f5610aa---xijebojerugeva.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb6fd58da---58357057582.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/78834594446.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/12438396568.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/jomevibiwopewulolegopa.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/jimumowudamefaxulowim.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c88501d421b6c5623e38d66b4f674983/tateduwebirorupe.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b509ba614c---pexubotokiw.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/zituvoruxi.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vokitewi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/037b869602bbb3273a5c2706301a424a/solikujili.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/javalegumovugidijagox.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_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 10176 bytes
SHA-256: 90b7919eccad3e69a5597d0bebb63a35a6a28884692aa7d4ceaf04c89bf382fa
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 17464 bytes
SHA-256: a998eacae76a3f3225742ccee36bc6ffac7d74aa7626290601ca5f2eb0eb7f5e
font_02_sfnt_off00012b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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