Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b368e9e63ea47f…

MALICIOUS

PDF

91.8 KB Created: 2021-07-07 05:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 43edffb44a195d32a1b997c70d02e352 SHA-1: a7ee48e7ec2ab379f328c051fecbc888240a2bb3 SHA-256: 78b368e9e63ea47f8e636795acfb80407a1c707ed23f5f7ea6c79ba47a434c7a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure as a link farm is a common tactic for distributing malicious content or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://akekaluck.com/ckfinder/userfiles/files/83984297182.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838fe65dfa3---marivofivakevagijutul.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/jcmc3kj3rn0885shpb9sp8cr61/4984553280.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7991e648b8d8d93825450e39acdbaa40/54491411443.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/48200030732.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/zuzimefevazagites.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90c4a111a---73846041187.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqa8os5c6ubh7svvg48jv619c1/75614405817.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h0adt8f7vvbbri22u24fv72s6q/55726903565.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/43599487484.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5b1164e2---niwozenoworekirupasa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3346091575.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/zupezelexozizusax.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3198q0ctae6p6lifaspp1lcebi/32411517700.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/21557293758.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/30563485821.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/60937087838.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626b8e09d9---56890414572.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/65143196917.pdfIn PDF document text
    • http://aimic.com/userfiles/file/66777596101.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3a647dd8096aa64760d71ae34260b900/6312860570.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec9928feb2---13831234322.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a041049d806---33153143747.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/16022036182.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ddf8a2a1d42f2fe9dcba99c1cbf3f4c3/koriwumawawe.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/7f7a1ba6919d4c7b765d3924906562a7/23357438529.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2f8d5d322b3cf35e21a458a1f42803a4/77420591011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=you+look+at+me+and+see+the+girl+who+lives+inside+the+golden+world+lyricsPDF link annotation
    • 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_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 17168 bytes
SHA-256: 93c7ba00ae6fbdebccb0e140ca22a6cc1a0b50a61a402d63adae19ef060b07b5
font_01_sfnt_off00012eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C8 11260 bytes
SHA-256: a05839238548505fd972567f5dfd16ae2e1768231882d21162f3f5675c96956a