Malicious PDF — malware analysis report

Static analysis result for SHA-256 d163af9ef230d08e…

MALICIOUS

PDF

81.7 KB Created: 2021-07-02 10:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 885d0fe4ed7e71c1359704d9a2e51f35 SHA-1: 44d3307f13cd173da459b33a869a770a9dc59e65 SHA-256: d163af9ef230d08eeac1a67cd05a6001ca335b3824d818a36692b16c9c233562
156 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://drafthe.ru/uplcv?utm_term=how+to+add+a+hyperlink+in+illustrator PDF link annotation
    • https://cambodiadriverservice.com/userfiles/file/6199600406.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/n42nquks10grgbtcog6br0e36a/97703930037.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/rapezoneg.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/sagidipejavidutosazebo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3b7c3d3e9---46550811409.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/jamapowofotosoko.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc8935794---43470584428.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/jesawamulerajoveson.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/minux.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/niranosakopadex.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc09fbaa04a---baripexajufe.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cb7fbf014---99914578785.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/digujufulexum.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843b78b3b7---kimaponomudusobix.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2aad2b286---25353550267.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/2715527065.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/47955720f132c71b659fdf257040b3ab/lefobize.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdf6866bb8---59992053874.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e4d0e3879e9e2897f9757933d83f889d/dobuxeloritibetudogirupum.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c21e992c---surupinepalafozelinalopa.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/witexiviruwerowurudi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607705a1ab1ec---86875021265.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/gikujaxedon.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5776cbe72e7b536d3855dcf0c39c0489/97461018382.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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 16704 bytes
SHA-256: 0c4c37ae9bed3b42a8a3f49713c98806af8f151b57e0bd9ea91b86c801ad7b09
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 10872 bytes
SHA-256: ff5c760529794055b3b6404b6a45ee76e24bfc0f2cd9de7cac55ea6f3e9c74bc