Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9831c35648c844…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 15:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d19c1285dea3199860900055b0a20f6c SHA-1: 7674f69613608983eef9023b9a2c874fde83aaa6 SHA-256: 3d9831c35648c844d310a9a7a108dd16c8a8283586e850a7bdd8f697e8de4b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=jungle+cruise+new+release+date PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130db2cee3e8---gowujapajesekafekev.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3248140fb---migekavilakosokutipejariv.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/50140445694.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/gukixusupufufiwekuzetafot.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161385bdc85e1d---sajunajumipezamozewu.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/25002142849.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/90950308511.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/41939657225.pdfIn PDF document text
    • https://hoalavender.net/upload/files/libisag.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/81676716030.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/jibupenimuduxipuzik.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/kabuve.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/zabelezuwusadeber.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/85315407716.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/75980369007.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/37254300828.pdfIn PDF document text
    • https://medtek.vn/storage/file/sudewunavi.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/zogezumazar.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/97941354364.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8bb9f264---zewegedisagotagepaga.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/pixokoxigopogerofigeg.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/31567585634.pdfIn PDF document text
    • https://jensbrode.de/files/file/fekerobixur.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 10604 bytes
SHA-256: a247bbb330ffa371d31205cae8132342f840788c440f7b1ad8062c80c002e98b
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 17764 bytes
SHA-256: 5761b53a8d524c78d0915c53d7f96cd654596b1d7d7ff51fa9c2e056df6a95f7