Malicious PDF — malware analysis report

Static analysis result for SHA-256 60688d266a40a397…

MALICIOUS

PDF

86.6 KB Created: 2021-07-03 17:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5bfd1eb3ec047751ff28db3cdf80f265 SHA-1: 78969d232156ed2193e020e093dcadb3479529db SHA-256: 60688d266a40a3971f5eb44a33ee6bc990169883a56a59118cf759f3187e108c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous embedded URLs that point to external websites, likely for phishing or malware distribution. The presence of these external links and the overall detection as a trojan suggest an attempt to lure users to malicious sites, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=spring+boot+security PDF link annotation
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/a9942ff828b269024c815f6c23d4fcf7/57548982687.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/kamiraz.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caabbcc690---97536897882.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/63299736444.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/vumapunekosexawiwanopa.pdfIn PDF document text
    • http://cga82.com/admin/File/81783700037.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/82491180281.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rm405q4hmm2gjmd3fcso0o8blc/sipegejizowula.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160799ff199b51---35338018704.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/pujadagerewananifega.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/80435695013.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d07e73d6---jarizivoxinagitux.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afadb46d87e---sogogazigonefasosupami.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4055c6e3---7536090952.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c49376cba---baxebizukewuloxi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf1fbd0de---xejuvarax.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/87249307104.pdfIn PDF document text
    • http://hodori247.com/uploads/files/jebugokugukigupudufewusi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e3392eb2---foranazolo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c497f900---79924383447.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c1d8faf7---75273075450.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/talikutabudebus.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rpbrb1p33lkisbnr425pvm6f59/9188326078.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b17d9d4a---73331811665.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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 10772 bytes
SHA-256: 6d327239dfe4455eee7eb045a35f4cb24a81eec60f4b0895c57956f3cfc6324c
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 17152 bytes
SHA-256: 19e1d14f8f93e228ae197a62ebda7bdb126c62aec5d2b166979f40562c7c2a4d
font_02_sfnt_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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