Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba59cffeafdd5bd…

MALICIOUS

PDF

81.2 KB Created: 2021-08-25 10:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0698e89db945217e2bd3c18e6a07b975 SHA-1: d368d7f4364362d873ef91de4f90d578cdc7c5b0 SHA-256: dba59cffeafdd5bdadedb54aaebc495c1d8d1b3ee8c713d43160128c120ac001
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 trojan. Numerous heuristics indicate the document functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=summer+love+ale PDF link annotation
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f4b6d7f2---35093962414.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/wavisiso.pdfIn PDF document text
    • https://songhong.info/userfiles/file/baditotimepirugaviv.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/2424629264.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/37608375744.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b283caadf6d---75603954274.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108202331391708.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/4117264254.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/33968364859.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/62280448871.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/nakezuve.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084054d2dfe6---86766395416.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0db9f5bb---rivinegiwelarijil.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/84002823834.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/tpirusa4l0ja6j97v8u217m265/82787867789.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c08fd76107e---letagilotex.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vgm8gt6tsfc6qn7vsgaatk49te/27880626387.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc3925fbc---kiwedutevozejudigexi.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/vupazovab.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b3f275ac---vivemusozokojejidexusuti.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8fdd6e712---26244201237.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/22835945242.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/jugoderowajitixuzoderuw.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b245e24b69b---37361487548.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/75013114153.pdfIn PDF document text
    • 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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 18344 bytes
SHA-256: cdcdc42b5eebd12c876ed04e3bccabc71b23ba21550981db9bc9a8711f13146b
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 10048 bytes
SHA-256: 66e2545c8029866d65f653b301b00d424985c98ff5da533c634e16b139835976

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