Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a77eea73d933da8…

MALICIOUS

PDF

97.1 KB Created: 2021-09-03 03:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b4ec6b874f7cc2f060f38e67828c7ca SHA-1: 784c2349f291d6389e0b972fdec93c6f741f512e SHA-256: 3a77eea73d933da8eb3036aff3144faa3f5a53ac261390e72cfa7542234a0e90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e735ab792d---15225461777.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a356fe6fab9---safev.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73288cadef---jipajawosuxipuba.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba6c3af98---51293371578.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/11768092857.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4caf02624---turewitalufunamenu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae2b04b59---jadizezezumofazem.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/soribudegugonirakubew.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/36500638515.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/318f9f1e7ec6137fee58bee7012dfd66/57372836416.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0c9b85c4---patakonagulutovag.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a43eca028f---simunut.pdfPDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8d052rs5475it7uev9erv9pfl7/wopixemuxofitetezok.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f3823f519---74748999084.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210619192514.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/buvejusu.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/30661729338.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/04728ebd5c19fcdf47025b1c86525204/xilidaj.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/tusuxelobubobexobuko.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/79f87407ddbd9c4de4692105e2e86d36/kegatenu.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/12397934630.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160dd65a294536---vigibesotu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9224e31b07---beramotokakovu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95otldl9hr4q1pc7ahl5hv0hk7/824679642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=frederick+taylor+management+theory+pdfPDF 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_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 19000 bytes
SHA-256: cc152d6189b34de06fe759b666150260c9a84c96a93de07f63cc8da52a091d5d
font_01_sfnt_off000143e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFC 11084 bytes
SHA-256: 6de9962d9399ffa9fcd3bcacf5f908b487f1be166e4122e441206ddbcb745aaf

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