Malicious PDF — malware analysis report

Static analysis result for SHA-256 843a7c3e7db42622…

MALICIOUS

PDF

78.8 KB Created: 2021-08-02 06:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3de7543949aa500afda77e0f36a45682 SHA-1: d917c20ebd5020bc191f64d74a5a737f690ea326 SHA-256: 843a7c3e7db42622fa353d3a6d58530c7e93358d0072aed0361f0e41f144d438
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jinistudy.com/_UploadFile/Images/file/riramapipumomokifepurizev.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/53305720787.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/53746677784.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/zemipevisemazap.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/47384339026.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kl39c730qr0thns5cg5dqelcg6/40812432913.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e49662799---vogopadafujufurozeto.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc1392fe94---15929562320.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160746bcd5bb45---vobunatanuxuraxaje.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/84478521985.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/ledox.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/gowukuwosuzu.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/36052125545.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/598a2aa66233763dfa98e8bd25263af5/87164265074.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/8necbanq56hlqvdmiojqgvvpfa/gejesodomoviwik.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lasagened.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/57ed0a93258fa6e57c046962b3657a3f/mojixunuraxeviwexilezedav.pdfIn PDF document text
    • https://jin-ji.com/upload/files/jevenejosaf.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b8a32970---49980823232.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c578cd2223---wowonusisubirok.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vc5ip596k8n7nat69uijo99k9d/43938020203.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/427ac248a5584759e4b2bf216522962e/murujazulepozofiz.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/02f94e6e2137528bcdd2f496ff14db19/27715112192.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607506888d48d---gegira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+you+do+price%2Fvolume+analysisPDF 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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 16188 bytes
SHA-256: 132a562febde4e9e03a1fa8a8be769dbc49a5757dd1178b3c8e41c839fb0e8e9
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 10968 bytes
SHA-256: 76ab10c058e6ac81a8e1ed8eac4098562732daf1d58ef56366b937d94aee5716

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