Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a1d956bd967687…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 10:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a133ea54db15378b6bdabd35fb948a19 SHA-1: ea8307e875ae6f82e295fa8f6147a6a9a943acd4 SHA-256: 23a1d956bd967687af4c8dd326bac249f1b1ec6da4915d172a648e44d9305ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or distributing further malware. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=lipoma+on+back+removal PDF link annotation
    • http://asja.ua/userfiles/file/9590998868.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/jedamadutaruleponomo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9b0c8dec2bc5690bd664d688e26aca96/12404026102.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/tulaziwadutaxazanisiwu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/63491063117.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/e206f22910976115ccd94258bcdb1476/wajuworunafabazorerej.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/98058944469.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/70145007699.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d9dce6ee---momegeleper.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/wexegopa.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/59157226584.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/515df74f462340a4fcd7b585f5e9e814/52884516181.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/xelibanemed.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b772bc82c8---jiwimadub.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/wutedunosezamome.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd54b999e2---fosofo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0a6bd1962b5b768f786cef44df393af2/fuzidogonotirujewitu.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/39585109002.pdfIn PDF document text
    • https://trexanh.net/upload/files/5318733613.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/96050553760.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/6110014549.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/luzewemikodiwudanarobop.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfea29c6c1---darunanategumawivu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/negojajagigenawa.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/najen.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_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 18296 bytes
SHA-256: 4d3fd2950de6eca99db14836ce82115f597fe6eb083e8a994a5700910b6a10d0
font_01_sfnt_off00011fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EF 10524 bytes
SHA-256: 9587f183f9e55756f78bd98ff876b656e075580cdcbc827c7d157cd5cd765d0e

Open this report in the interactive analyzer, or submit your own file for analysis.