Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8885bb88c3d790c…

MALICIOUS

PDF

94.1 KB Created: 2021-07-23 11:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2791ccb32772422612cf04f7844fa48 SHA-1: 355c209b4376d2c1c7872b681dc5ccfd7f22042e SHA-256: c8885bb88c3d790cc555f0af16cbadb1c69381332722425aa317841f2a68c571
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f1cd3b237f66119a171c8ce2467a6be0/31342744453.pdf In PDF document text
    • https://paymentor.nl/uploads//file/ginufoxusijedakom.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/2348209634.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742a54cef56---22931502824.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23308d0de0---pubusuniwetaxosamarawejev.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231431e6ff---jebewoduniwuzago.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bd233d5664a---jafuvovemurivimotabozora.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/fumezulosi.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/70096652050.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/81756833537.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/9367191381.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/cd50c85e93fbd8e03294c031b45fbe95/nadegiwe.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/92550516342.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160785e0de1e35---61788946647.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/jabajitivefitog.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/51578464609.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qgrof3h1q6bouslfolbe820h69/82364633395.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ec6b17cd4b982349bdfed57c0834197a/kobob.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/64401426490.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ad2f8d31a3d81387a9cc6134ce2635a8/lekopagufuzozi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/d0bf9oipi53a0s27hr8310hj61/xisisubedidisakuvure.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160780eab95cfe---lulaxotixekagusosivure.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/rggr4fq2j6tu9qdvbe03iiq0dl/jukewatetubikomala.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f740d87067e4505948975ef469b676d3/59169905606.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57633b93c---31138459967.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/63366315622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pemdas+examples+with+exponentsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 17960 bytes
SHA-256: 6126eef0b55a51082de739102cf9a16aeb4f36bf452c381a2ff353de4f42a6cf
font_01_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 10744 bytes
SHA-256: a2922c16b3d092ed12bbfc6802c04fbc1689e328f80f6942cfc7990266ec2e47
font_03_sfnt_off000152e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E9 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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