Malicious PDF — malware analysis report

Static analysis result for SHA-256 022216dcd96b78c9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 20:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d875205b0eaadf885ebc0cdc4dec35c SHA-1: 4981daa7da8abffa8df0ea1e40d8b668fb8d26ef SHA-256: 022216dcd96b78c9c2f028c3f7a71ea4d13c403059681056d99df9f60fe706ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lure victims to potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607755edde295---58706508249.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be40342e55d---88988187379.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097a423587ea---66974139653.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a73d1c04e---desosodanuluxudij.pdfIn PDF document text
    • http://sissonne.hu/editor_up/20396258620.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nexagekapoxepuki.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e321e0c42b4304b60ab98625f8a40ecb/mewipikovesikanu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/83c0b88c23cb4e4cec8e42eae55f492a/15996976363.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d909597aee7---86117324635.pdfIn PDF document text
    • http://land89.com/ckupload/files/gozumoxiwebowipagopoxom.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/dovitapinamavefokowow.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/19e8d11a51312f564961a37d6de9d258/vatujobonitu.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/rovizoxakararakob.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/pagelokitagumutokad.pdfIn PDF document text
    • http://beiks.info/public/file/96957239691.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ggc57amdsic2uump8u5l0ubs1/84541368148.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/15307758304.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160849d6ce02ef---54387632171.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/podosejatapigiwu.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/62512541737.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9b4e846aa1dc66c61d16b10c5629fb34/tufafukavitoli.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xorezafogasusowujetex.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/62af22020391bc9ad607d1080b50a435/94931713449.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/zavekufusezazivebome.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-1/20210601025223428820.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1d432afa---dokajuziwurow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=formulas+in+excel+worksheetPDF 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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16508 bytes
SHA-256: 11967e8db92db5cfa8e514f8197304bd98c0e03d85890015bb1da0cf76b54968
font_01_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 10852 bytes
SHA-256: 9bf76b3e86dac65bef7203a882d53f1964f84340cd889209e76393d80cea731c