Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a2cabe19fd444d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 16:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8761107481eea816e523234c62cf9c8e SHA-1: f5838c793e47ff12f62a2f9a0a5d807e3813c59d SHA-256: f9a2cabe19fd444da5411251584cada045222b5865319f24bdc92634778fea0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jiin-torng.com/uploadfiles/20210913175733.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161444ab5c43b7---mesezeratilor.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/89392196141.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vajavolitunipelefikon.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/50160563239.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/77672996571.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/12703477333.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/pipiruvifete.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/supimirozojade.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tutitarujowakolujawokinum.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131bce64a1e1---7641981389.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147db2026965---menojidegumedagelibar.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/76728265495.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/86658050696.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/89471214569.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/wupibulofefon.pdfIn PDF document text
    • https://akvaguru.hu/user/file/90593145028.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12107549964.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/84886570299.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/40475101280.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/sajaxir.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/suvafamupedenujep.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/novawuki.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/jakulojadufaben.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/58332480121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=face+chat+lite+mod+apk+downloadPDF 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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10664 bytes
SHA-256: 9928fa5a371292d5c78c35fa4168937c8f620448c0dd091a16dc79877351ad51
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 17256 bytes
SHA-256: 46d9cdb228bc2676648cc504c4006f2757c307d79ba207ae402efbf4d4a34898
font_02_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1