Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace97dfe94f2d20f…

MALICIOUS

PDF

91.1 KB Created: 2021-06-29 15:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 106faa350f6d7a65fc26d3cbd1c7ac23 SHA-1: 04ef5961232451484f3f77647750808362021f34 SHA-256: ace97dfe94f2d20ffa3bd899d146ec4bb391cfc90ba0e6893cc374cffe070234
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, utilizing compromised CMS uploads and disposable hosting to host PDF files. These PDFs likely serve as lures to phishing or malware distribution sites, as evidenced by the numerous external URLs pointing to such resources. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=blue+grey+eyes+meaning PDF link annotation
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jsjtu8ks64gab6i623hj66rrul/nofepelimoriweveta.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c4e810d5b45ebd1f8a17560dcc66b6f5/23110596475.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/36607772243.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/66088250877.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fac58c17cdeb60d3672563aa264a4e4/mivojufawuzomag.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/76318119001.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/jazixipelepotul.pdfIn PDF document text
    • https://maturana.cl/upload/file/81683108761.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/44068120030.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e22137501---11926261086.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b0adc496ca255e62755c2ddce0f8d46c/51159638692.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f154bc0f1e---mibugimebikekewokivuvobi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720611ea6c7---nezumafukinatukiwaxazul.pdfIn PDF document text
    • https://artenika.pl/fck/file/difumoxo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde0b5c8a8---41754079025.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ek4vih92ufog814vsgckpnfiv2/katiwulumi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ef1572ebfcf896f363210df1c79d1358/48483494333.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cf51d6d1e58c67d8d5276df3eae119c5/10398521288.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/jokakek.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210617041322.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1alirbvf8r9h0jv98n66co1105/xexukobozofatikikipa.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/up7g7gitdcq9khheqca5tc4343/8930532947.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_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 17312 bytes
SHA-256: f0090933a29c143b06667ec907b84adcdfff1affe981264eb704b5211dd774ba
font_01_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14797 10500 bytes
SHA-256: 8ff2169336e1c9d1f6f03698a3509b8879466dd4b237642202e90f6c1124b6b6

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