Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbd1424486801c8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 05:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2645ca3a4059a0f73eb62211a409240a SHA-1: 39e7c964b9d4a7df43d8d935cf6c79d6fe3c8958 SHA-256: 4dbd1424486801c843436b51c219da8028cfdb47093f44aafee21e8980392c89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the use of compromised hosting suggest an effort to obscure the ultimate malicious destination or to leverage the reputation of legitimate but compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://handinhand-daycare.com/ckfinder/userfiles/files/58872918716.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9ffffc331bc4941d960a847783c2035c/libuvejazabopezo.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/53917636659.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd722bf44---67407518113.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/kamiwotitugana.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/2e2148927c69b2edaeb0292fe3e20e9e/lededifivaje.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f295626d---96743255240.pdfIn PDF document text
    • http://unsersohn.ch/images/file/xikijuwun.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74abc49bf---32356188896.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/54742178222.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xewoxekulibejawuwutuse.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/9744221509.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/58094218227.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/85214169700.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b423f763697d3f991fb433cbfee7b5c7/93270312462.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/fidinegoxa.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/sulirotalazeravuzutetede.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb754cb331e---juzefafetoluxaveg.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/pawakemotupakomod.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/adog.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/66974144258.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abbd22dee---92054649349.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/74391855304.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4694b9ed9e---30110189561.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0ce6ea8e0a1902836167a090409eb7b9/kotoguz.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a927e01c09---20863764107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=end+punctuation+worksheets+high+schoolPDF 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_off0000c42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42B 11056 bytes
SHA-256: 3b41de516126805740ad2eedf5b944cd9a49e270e0afdd8998a9a016898b978d
font_01_sfnt_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 17564 bytes
SHA-256: dab79928a020e59182547c7eb5d5a9af2c579f592a4f18f330368a3a006dc941
font_02_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1