Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d5dd0eb7fd8c81…

MALICIOUS

PDF

96.5 KB Created: 2021-08-28 16:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d413ec2b5794720bc4f5108e5c261ea SHA-1: 3d6aa000904e7a1747f140ce9a706f833c3a78c3 SHA-256: 82d5dd0eb7fd8c81311ef600dbe17604d1e8b81c935a12abcb8feae447b7cc94
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or engaging in phishing activities. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://brickbodysupplements.com/newerac2c/userfiles/file/toloduf.pdf In PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/53810627778.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///73237388854.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/tirelitumonivep.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/semuvotenilabuvaj.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/36536709604.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nul56d0s9sea43qpil69mgala9/bizafivoru.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c26a144ade1---fogavamulonimuzuvotuw.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/25716712209.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/rovedasotajajelidubob.pdfIn PDF document text
    • http://kaies.net/upfiles/2107251348388016597geiza.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/h1rgk0osfhiup241uh2tvamhu7/jukuwobalesupaz.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/44915883585.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/wimefape.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/15094180466.pdfIn PDF document text
    • http://fs-select.com/images/blog//file/pixanojanexowusomuz.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/rixezalimakafokepa.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zigutivikitabuviziguvur.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/93952915267.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/80824513121.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/39594930205.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ccd217691---59656885046.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215488151034.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/gumol.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c25265f6---pirekin.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/60376097177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=preamble+to+the+bill+of+rights+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_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 17784 bytes
SHA-256: aa6a9e36b2a8e0befde75d47428342f6f07811a0988f52bdfd83c4a0d6991da3
font_01_sfnt_off000142b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B1 10984 bytes
SHA-256: 5e9b859c070a09924a4a23741cd514c49a1b8d21e69ae6d726af416e8873c3b4
font_02_sfnt_off00015bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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