Malicious PDF — malware analysis report

Static analysis result for SHA-256 6633b4769adaf9aa…

MALICIOUS

PDF

87.3 KB Created: 2021-08-17 19:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 632ad48b09ce3bc88ea9284d688dabdd SHA-1: 84be989c0d4183a7a5c83fd22505d81df2806c0a SHA-256: 6633b4769adaf9aa75069953e83d61eed326612036e0709cec550dcb210eeff7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious content.

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 https://crysiq.ru/uplcv?utm_term=rosy+loach+care+guide PDF link annotation
    • http://air-ned.com/uploads/files/luxanetimijufemijafur.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/96662800860.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/g8eve95f986er991o61bj1lpt5/gafefun.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/30924041652.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/61108782616.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607418b92f9cc---gevunamulatuxukopexelizi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/rifomejefelor.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/58493428127.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/46483838394.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/vgkgi3noqlivi0ujv8l6fn8tam/nogagal.pdfIn PDF document text
    • http://josquin-capella.de/download/kunabufopin.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/33231522537.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4a2iactk4koqghjdufbu7s6cvn/jugozizerexilaxiti.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8338e83da6f1328ec4823bc7e90b7623/20295549492.pdfIn PDF document text
    • http://liyangah.com/Upload/file/dezanivabuful.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/tubed.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/23956159665.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/51870805851.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/ferapasukekidumaw.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e7f63ecde---warigigabiputiwanobasox.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0a14570bf6e96e8fc94e6630bd8175a3/44916061169.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/89310181031.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe405819fb6---65238697523.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/2lk3lpbji8n5pqpk92poq6k71j/ruzoliv.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/xikuxuxoru.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_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 17180 bytes
SHA-256: 90001e220122cec2438902dc16a79cb23fb33255722b67ba2f3b2ea295f1d97d
font_01_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 10708 bytes
SHA-256: 651a7a7cbc817c0eba8a061247306f0ef678c6652cbad8f2fb9d9ed94fa7b6ae
font_02_sfnt_off000135ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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