Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3ed435707bbbcf…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 20:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5125f4a9819ca9f077f180ecdfd288a1 SHA-1: 6cfe41c81ecba516dcbc6af57c13ca9ed4685522 SHA-256: 4a3ed435707bbbcf4f91de3684c9d42e51815a6d9a6fd3c81edd3c5f211387dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to various external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary function appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://delve-cr.com/uploads/87857201600.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7172d2dbb3---zimugizazaz.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/4fak2qg4qtlio5jvvlbu64mag4/85980364920.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/72783048803.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hh85gvhtgrcbc1s6jfcu598s6t/36407450159.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/81546466425.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/48643031463.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dv4eia1uv4ci3g5vmo62744buj/41337939527.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/kumitikejusenosemeter.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/98127245370.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608036f024117---bokisowegajozubode.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l21aq55iuin659of9pp9j7o0j5/56162007097.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/87371566498.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/xebusatenigarekogisapawa.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096ba6ab6cc4---xaroregonaxasekobefomewek.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/noroboxexogalafonire.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1dfa379e8595d3362c5a8104c802c1a6/2659110258.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bd4cb65a---17947314840.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/fubiziwidepebiwavamovu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523135308836275.pdfIn PDF document text
    • https://digireg.it/upload/21579902128.pdfIn PDF document text
    • http://nemalipics.com/sukimekarunodajimuzuwi.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/lubovajubesubepidil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=expanded+form+math+worksheetsPDF 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_off0000c4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 10888 bytes
SHA-256: 074d8b6369f512f97988276c6d52d2b1a73d8a035afaf8bda7ee47847b34d6d7
font_02_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 17192 bytes
SHA-256: 84b7eb560052694c10770b01e0748f28eea432c06491a77caf3f0e2d7672fdb8

Open this report in the interactive analyzer, or submit your own file for analysis.