Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44cd2b091402519…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 08:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91325034e8a975ebdec48dcf2cde6bd5 SHA-1: 201fa86ea06138fb2efe4f7fc909061c683c2313 SHA-256: c44cd2b0914025191b1304ee307f9d19685a13762b186d5dd121bb5f3e211d16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and other potentially untrustworthy domains. The primary attack pattern observed is the use of malicious links within the document to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/97050790922.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf555ca918---pemarefabinejaku.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/98619660059.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b8229p81u54p6l4j3gkdm90kl5/bilukawejek.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756eadd03f1---tojibewipidesuzaxe.pdfIn PDF document text
    • http://hrudolf.com/userfiles/midinidasim.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/84280720367.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/50802323727.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c8103d84f4fc2d2364f0e3f14b99f2ca/bowezisaxez.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/gudulu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3e4b45af447fb0cb9bf5e109870173ba/tutosukogalonalusejet.pdfIn PDF document text
    • https://coil.hk/upload/files/60948336.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/gagedivogotuvuj.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a243aca84---26244739339.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0rddebhq4n7s27vimj0ks66767/wawoviwus.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/vomavujula.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/570cf670f7392db9822c12cdd8d3163c/zanede.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb05756a8f---didugodilorujenapopu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe55b776c---66660647801.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b72686a9---94511193336.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e01f02c3d---gowosanizokitakuwarezi.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/vujubopuri.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16129a6d19f0c3---58682569214.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/87560231288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cabin+fever+diaryPDF 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_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 19128 bytes
SHA-256: 2c38e829cd15c656c817c6a0c5f24d3d730157f72c00cdc59fe9a8ba1ebe5cc5
font_02_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 10264 bytes
SHA-256: d6a23a936ad587d2d77e57bc569f7e46160bf9d89514b23e2a3ae40b749fbd9f

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