Malicious PDF — malware analysis report

Static analysis result for SHA-256 301fff5979a836f1…

MALICIOUS

PDF

71.2 KB Created: 2021-07-25 23:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8215a3d3831bfe21d26a9548ba03772f SHA-1: 115c488fbae0f89287b19e0b905ede64d7b00557 SHA-256: 301fff5979a836f1cc220a6bc3d34514834bb993a54482153bb022fe2fa1de13
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 links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://call-life.com/ckfinder/userfiles/files/gezaxegebotivuwoke.pdf In PDF document text
    • https://powermailer.in/userfiles/file/letarafamaxibegare.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/sesames.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kuce7gell57ipq03mioc4prhei/wuberadajiwubupukob.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/tiramuzogukobidinajaxel.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3hvl8v4mqhu0odapmnmj86vb24/fuzosefapawatakuwutelumu.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/39816408012.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/22a26f6a3f1d141730536226fbafe56b/sikimi.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210629023713_rv95se.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210509081517167.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d5c233cf9ec531d9feee7739840d4d35/wasajo.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/zusepunuxut.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/0b4720707627123ed187bc208c26ba80/witezotabiboxofamadawil.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9a09ecd0e8b63af8ce59f7bde8f01997/15436727744.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a7c867668368752f7effe2717ccc5e2/77296268670.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/4113560873.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/3444148325.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///88644632757.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf102073bf---77636225223.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3aceb661652b04e82c8be2039623ae45/49186479873.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rblpqsmce8n411macsvh187352/gowelurikogasafefujaf.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c521b48dade---26586965735.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e032b4890e---48611056259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=teaching+cooking+measurements+worksheetsPDF 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_off0000b61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61F 10872 bytes
SHA-256: e371c8de693ebf046e0f8467fd2ba51b45b4b9e63fd51efd527359c7cc1c21c5
font_01_sfnt_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 15788 bytes
SHA-256: aa8d9e9084e502a314a350a5837dd529bb6dd64e7ccab8e42442e8db5fcb46b9

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