Malicious PDF — malware analysis report

Static analysis result for SHA-256 540543d2382bd575…

MALICIOUS

PDF

97.6 KB Created: 2021-07-31 13:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18c5a454adbbc5251e5a0dc84881e662 SHA-1: 1cd11e7e82072b3b7b942d5b14ed449bfaecf94b SHA-256: 540543d2382bd575eda1e84d562c9db2f6307514764e6834bacac3bcf877e53b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content. The presence of embedded JavaScript and a high ML classification score further indicate malicious intent, likely for phishing or malware delivery. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=what+temperature+to+bake+otis+spunkmeyer+cookies PDF link annotation
    • http://barnesfamilyre-union.com/clients/52050/File/20463386674.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd40151eda---sanug.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/qdamjg6ego22g0fuoqdrr4l76f/4412067481.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/webijojorubowupuweb.pdfIn PDF document text
    • https://inncredel.com/uploads/fupaweza.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/fbrfhahach81m0e0g4347nbq51/21996621196.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/87d3inc15pbo201eaqjhe0lntj/xakolizupalololutugarit.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/jupogakapiwozekiv.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/4687985684.pdfIn PDF document text
    • http://isgsrl.it/images/file/lanusibadabikemeluso.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/fupamasalememiginododumu.pdfIn PDF document text
    • http://lagrupacio.cat/file/71969984604.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078abe8c95a8---budesivezijesebifokamimat.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/vojuw.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/faxopogagedol.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca93e552df4---gajuwofipa.pdfIn PDF document text
    • https://ei-hotel.com/free_images/files/25426215766.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4d1189aa0---rusenuvosexazuvitiver.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/dapaxinuvini.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd467219dc---nobejuxevejugivanetojiw.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/76129365142.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9103919732.pdfIn PDF document text
    • http://myslizdrave.com/soubory/lunulasurin.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/pejawalasagozenelukufafev.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/93728999002.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b540d9b5f---sevujuxeweromifelarade.pdfIn PDF document text
    • 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_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 19012 bytes
SHA-256: f1d7d7e6dcd9858650fc8185d73d1b5b61f24e744593d70d43e50552b753f5f4
font_01_sfnt_off00014665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7C 11032 bytes
SHA-256: 1e726de2c098ba61119cb5937c0b8c00c8eb0d2c8b2fe7943f93c15b6792a60d

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