Malicious PDF — malware analysis report

Static analysis result for SHA-256 290acca63c6030e1…

MALICIOUS

PDF

78.9 KB Created: 2021-07-08 18:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ebb4ebc38006bdfd853b3e07cf53653 SHA-1: 9f454568bea8fc9417c48d978e67b73c01c4239e SHA-256: 290acca63c6030e1ab16fee7ed270aaaa6c6faa87e2ca31cc3b6a6d8ded0864d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ede0ab75d---nagojonazidi.pdf In PDF document text
    • http://kapli74.ru/upload_picture/81930141616.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6188a062271d3eb1cda5d77488881ac7/37324916395.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d48d879406---vaxebem.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ea42cf9d---mitigolulogiwovotodibiw.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a2d3208---72827046295.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/biworirizotesav.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/34548742717.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210522092020162.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082390882226---koruzotejulu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/86608635980.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16208420548482.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b12b338ccd749ebc7cea91e681666b64/geremupodudobowujoferaw.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11b1a06d1---30151521807.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0f1d8c0d---15023212539.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/50794092923.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/dafcfbec9bcd9dd5ad02cf6d24fee3ca/jozokigobomabozuku.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/nasifejedinelowisapugu.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/tijovi.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/motumufuzumitisowepo.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/bivumi.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/mefakovakovowe.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/74155919808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=1400+kb+to+mbPDF 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_off0000c0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A0 21212 bytes
SHA-256: 147b48a551500d2ff769ff958b45ad2bf30fc6f90f552cc725e28c6fec576a8b
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d
font_02_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 9852 bytes
SHA-256: 15a9e8152b887e5db12be54c59a6417d491e1a151be2691022c6642df426def8
font_03_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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