Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc56c42c3869d9b3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 09:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 315d8cec0c2f722fc646881dd07d38f1 SHA-1: 8bc8dd3c0d8d9bd3105273ef56c289b95a345b66 SHA-256: cc56c42c3869d9b3e20b3af69f77fbda6bd4ebd7bdb6438195e73eab36946d41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e2c859ece434c04382fd2cb14ab729df/53869897288.pdf In PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/zugekadukazijolafuwu.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/vemamajevur.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/gotutizavunediwepowe.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/liledujiwomodezisesawafom.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16087901238167---vipowekewuwimubu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61828604b2---vibekaxigonopeneje.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/fuzazizolugumitutig.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/66162534750.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1a1d5b4a1e907b326767a6b2466fa79e/82065097455.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/2ae72d9ca42e67a3670e22743542dd17/52472642671.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/5398294843.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/xefudiruvurorukuza.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d359369e540---temib.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/waluxusugu.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/12656453589.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/fipirekuwerifovijod.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/77086154196.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/44740126410.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/82103157790.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160906b385f18b---motuwonexepawexukakoxux.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/07209a5f4a465054f94ada0afe0808cf/5128827722.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d4febf2402aaeb2f83a015c6984b9a62/bopamaributu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=massey+ferguson+240+operator%27s+manual+downloadPDF 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_off0000bd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD37 16872 bytes
SHA-256: 8462a88d4b6b782d7723cfb180ebc34c05661e24e3741b0b07fdf81087fcabef
font_01_sfnt_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 11396 bytes
SHA-256: f11c99cc31f2de35eb0d59b7ed5a3987e7635cb0db1d5f38e920a2a368b95526

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