Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf9e2a9fd0c6260…

MALICIOUS

PDF

105.3 KB Created: 2021-08-04 13:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a311004418d14c4f593fefdc0a65a2ca SHA-1: 3bb6b4b16c17b38158852e5e00eee8aa0cda3493 SHA-256: 7cf9e2a9fd0c62600ab14778f50343ca6a475477c5451e188ea0fc3a2543867b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9818

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 http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a1ac9897---75146008161.pdf In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/912f924b25af9b93bac85a7b9034606e/35264800626.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/20061729945.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/gupakaxuwuzo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0a9ae64890e8713955274c2837f27557/51392620739.pdfIn PDF document text
    • http://jucal.es/images/file/88611609497.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c316756b0e8---59373260897.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/nagewi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c2f8cf332---13979140435.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c526643b5bd---soniramomixila.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/zemumidekorezeduteb.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7754a3001---98520060306.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/11919736379.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fd950c130645fe56fd5366d528cc7493/78326763795.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9856da7d5---jenirimevix.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86bd9650a---newapevovudi.pdfIn PDF document text
    • http://abnicum.com/files/file/72064147679.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf1518165---wobofaketokevikipef.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1623915998.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cfa6d81dd---14186091488.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/73955714280.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/betokebovaka.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/texizamusibomedebasuworun.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089daa1e1d4d---vejilusivupew.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/6206465400.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609024032a59a---nubobese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=aplicacion+de+ecuaciones+diferenciales+de+orden+superior+en+ingenieria+civilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 10844 bytes
SHA-256: 8bd1fee5ef4b83f715b3ca510aeec4c9fb1ce50c857ff9a2e013aca30cbd95f3
font_02_sfnt_off00013596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13596 18116 bytes
SHA-256: 4c127635b8f738b83fd15f83bcbf97ad4db7d421ebcad06dddf54ef616987e8c
font_03_sfnt_off000151ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AD 20764 bytes
SHA-256: eb486732ff5f335aacd3bf4d0796bb5fa6abf846bf56feadd15e938171486ccd
font_04_sfnt_off00018969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18969 2016 bytes
SHA-256: 58e82847ae11fba2946deac60ba4711feba7a78cd90cc7117ae6c64f84994f55

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