Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28265ec39ff33be…

MALICIOUS

PDF

215.1 KB Created: 2021-07-02 09:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc0f23f3368154b4bd8423a1b4957154 SHA-1: ca873cb961fd2f6278ce45b77257652dfdc7eab7 SHA-256: f28265ec39ff33be68334b945c5f627952ff48e66f6923fc8ac8a4d510a349d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS upload storage, suggesting a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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.
  • 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://aeronautike.com/userfiles/file/zuromipebaramudewosavuv.pdf In PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2e757fc0201bf50fc499cc5cab656eab/97875809125.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bf1b2c1a2---58676239295.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/92bcb59c5b2ea5ff49740707a967e6a4/29048254078.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/dogorilatarupunibed.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/913c44308af9871d4dfad3d72bf92804/welofewikotinatulubuxigon.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870cc020a7f---29194322643.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad950f11310---9588055009.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210613040117.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jarumaripuxodelekoge.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3d10f2b0e3d09dfa71b15bbaa7f64acf/zoxinekugeze.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb6edc429---xokalen.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/72895814362.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/561bdd050faf0a29f9400a12d5210d40/83277535861.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/92562062524.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4b4f05aa---85259875500.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/69480296840.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/d8qmq5ned4jgsg4s5usraqirmt/1857712738.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd9c59eff---jufanuvasesuvoxu.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/61969807446.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c6488a74---39601246417.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160daef03f130e---75912979756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hot+tempered+personPDF 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_off0002e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E208 10244 bytes
SHA-256: c8cd431b8aecf990270b43ff75205417a357df6dfc35ab0b637ce8f40467baae
font_01_sfnt_off0002f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8F1 25832 bytes
SHA-256: bd28a5e55475bbc3ce790152e3194da3f552edf77110db76f5cbb1fb0a74a5b7
font_02_sfnt_off00033777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1