Malicious PDF — malware analysis report

Static analysis result for SHA-256 9455c3e4a65f0846…

MALICIOUS

PDF

76.3 KB Created: 2021-08-05 16:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3819e03da31e6884e681db12a4a3fccc SHA-1: 60362f1db9239f72d083ddf9cb4b8b57007fa09c SHA-256: 9455c3e4a65f0846ac5defbb2300da534a5da0cb985d71a0de27198e2d2957fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The PDF structure and link farm nature align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://10glazsikeyrosa.ru/file/2003973553.pdf In PDF document text
    • http://trevorhannant.com/50554130833.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/15c27d4c1320091196b3fa8076c2d3e3/50903517434.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ked3i7klh3m4ch6dsan92vssgo/biwabufesunobovi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/sometiv.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/xixisusojuvijulogu.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/94252095844.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7524825e2fbec80943b975ffec82f718/17685359934.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16280572272109904985.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/kikod.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/24878025294.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609617fb9c222---66584198452.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67cc9b8d92---napewu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe3738fb2c---62294984663.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/majewajonop.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608312b1a2378---mediravoxudaxofuxuseduze.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/16453545473.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160af9642ce985---limafax.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/rh38pvjnm3aqe05h4l9bhdnfk3/wiranudezuleje.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/60337054787.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1d713917b9a3fed3cd96a1fceda59792/natudatirizifotoxi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a3d93347fc1dadba61100dc4da42b3a8/80567478151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=passive+voice+exercises+3+eso+pdfPDF 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_off0000c178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 10708 bytes
SHA-256: 02fa2f1dd915689670ae262efb26ecc160f2ef1c89984cae075cf2a91064c1b2
font_02_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 18656 bytes
SHA-256: 7ffb6e6c934586530907508d9a1d71d92d70b5edd2e906f1b44eb3722aaf804c

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