Malicious PDF — malware analysis report

Static analysis result for SHA-256 378639b8eaf39b2c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 05:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a372adb1c0f0900e28457cd93f3ab7aa SHA-1: b5fcd791e305173c118c89d4258be4baf100f01d SHA-256: 378639b8eaf39b2c21f353447118c66826384b1d026f5c22e87394d1eaf523ab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites through a link farm. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tecs4.com/intranet/ckfinder/userfiles/files/fabafoxepipegilepulafi.pdf In PDF document text
    • http://kvarkeno56.ru/userfiles/file/8463301030.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/jenowikesugevu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/dfc28222cb3e1b8f820c967b942593d3/todofawumuxosexeziw.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16139f92ce5f5d---vunutu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161303afd44444---91994200981.pdfIn PDF document text
    • http://linza-market.ru/upload/files/12445992827.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/96299707048.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/donupusesobetekufufu.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/mapafuduk.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/xofakoda.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/sumijo.pdfIn PDF document text
    • http://cycling-software.com/files/file/72106564609.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140942515690---davevafarudogowan.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/94133871999.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/kemuw.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/sobuzugotipefamuroxof.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/diremarasalafodasebeko.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/dasitowamu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/daputuzobimuzefixaxesina.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/muloru.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210919070337.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/37831596389.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ft2u204u2sqclska95uj98h1em/selexidafoniwepowajiwizo.pdfIn PDF document text
    • https://airshow-bg.com/file/11980745083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=droid+text+tonePDF 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_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 18460 bytes
SHA-256: 603c0f88981ffe523266952606636b2474693619be64a6c4178889124df25ad1
font_02_sfnt_off00012ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA0 9968 bytes
SHA-256: af5721d3964396e5c7590597d8f864ff41c6ffc2cf893b241a1d0df717e73042