Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc79db905e5f1d7…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 04:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53c25fc73c50480cac7afa1e6c7be519 SHA-1: c307086d87034e87fb5b9d53778255f4e141869f SHA-256: efc79db905e5f1d7f1fc7af1e7117b5ab8d6f456f19982f00c1518b73d4eff89
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

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://inwebjor.ru/uplcv?utm_term=easydiag+app+download PDF link annotation
    • http://familiegravesen.dk/userfiles/file/dudoxanafoveb.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109210308483258.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/raguvipiwiwuroto.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/geranitoroxetumasuge.pdfIn PDF document text
    • https://educhina.mn/editor/files/zebisemufuro.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/keparivizakezoriwubizazow.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/xuduweruxipetogi.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/pamogobito.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/84978112423.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e5956c758992d3fe578c6a94f8b7f746/50509521025.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb38dba90c---disezudimevenosozowu.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/90640135825.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/24176343165.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/59541130767.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/48549458073.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/53910510499.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/jokitufi.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/92533146161.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53089674079.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/521dd5b5a71913123c0b3177d7f445f3/rofaxojaxawibabo.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xadorosefilixapamemi.pdfIn PDF document text
    • http://ping-property.com/user_img/files/97901766005.pdfIn PDF document text
    • http://airzo.net/userData/board/file/84744485157.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/57230806200.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/10526833532.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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 10420 bytes
SHA-256: 0bd091bf65758c3a0bf41974268526f4b10c4563d658329fb7f9abd5866d6f89
font_01_sfnt_off0000cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 17200 bytes
SHA-256: 5aaebb85c90a91530e5568e25cdfaf3e35db82f810775289a7110c697b7af605
font_02_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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