Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3561be77a03826b…

MALICIOUS

PDF

104.3 KB Created: 2021-09-06 06:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a575a1bc837c3576f460d4b7b9d38b39 SHA-1: 0289d28993e65435feaa0f6896b5bfcdfec8e3b7 SHA-256: c3561be77a03826b1ee830bbf27ddf1bec955ff0c7d4678dd820ca34bc981606
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 or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. ClamAV and ML classifiers confirm the malicious nature of the PDF, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://rc-modeller.se/images/file///23015676371.pdf In PDF document text
    • http://be-now.pl/userfiles/file/miwojapemilepi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16125539c2ad72---38481993035.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/dikid.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853a6cd58d7---pawadif.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/48924308564.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1idv5md61afik1kens986l90ja/felanobixivatotizap.pdfIn PDF document text
    • http://newmob.it/userfiles/files/25610166937.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/kakasewat.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d87bda065---sutokaramebowowor.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/dalawujusegarugizake.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/givifisafinafasazugemenis.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/wupegakolugi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c6bc6ffb---54380697966.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a148610b14---46874504930.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/33504184316.pdfIn PDF document text
    • http://sb-78.ru/files/file/81276312981.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/91705795913.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/guwubakobuzinosisozizob.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/dfd23bac911cdfc27775a2233f535fa4/77515797516.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/32313254609.pdfIn PDF document text
    • http://cwesp.biz/upload/file/50063294987.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/mutivepinamudibunejigefo.pdfIn PDF document text
    • http://groupkaishan.com/d/files/vesepu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7507e4322---faxibemunamejuvopab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=24+dinamicas+grupales+para+trabajar+con+adolescentes+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_off00012e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 19588 bytes
SHA-256: c13e65926b0d116864f0bafb361d58038950069a77a5a01e4b828dfc895f3c46
font_01_sfnt_off00016048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001785f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1785F 11436 bytes
SHA-256: 4bab407ed47f730dd20121cd7261c8cdb566fb97bcb4ac4dbaf12662215aa65e