Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be13b1ecf99b0f6…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 22:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 092c4eb2a129ae4bbc72eacdad11ae06 SHA-1: 860d4f7728519f37be5a18d598d1e052a598a669 SHA-256: 6be13b1ecf99b0f64f45f3ff458e9356c2a87220bca4b921129159fdbf294800
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the classification as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=growatt+hybrid+inverter+manual PDF link annotation
    • http://vipnjl.com/userfiles/files/zovoguzodularuv.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xenugipipeguzuj.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/17696123764.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/78125e1622e23d5107486cfd347f043b/jilapiravalefefi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b3aa75c3d---40925347043.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec9c1b003---51983093553.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/525fb2604d472122edae264e97770103/3090138238.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/98490241540.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/83797753568.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/brrmb93egh945itm1me0dsmn62/mefaxuwurupote.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607933047ee0c---fuwunepepazinipot.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/kejaje.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf46c4b18---48873821959.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-3/20210703154431680253.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0991444d2f72d3d5f50b0462baba3f47/83918118422.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f92ae70386a---tutakuvo.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/pisajogadufonudemi.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/20644580386.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/58t95d6ou934omo59ch582pu7v/kimepaxipivokixivogituki.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/5984909975.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/50871479376.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/34710656746.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_off0000c4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BD 10888 bytes
SHA-256: 30e47655ce1adf5919636bb073333516bb0986d9e61c613ad4d99213c7db1370
font_01_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 16184 bytes
SHA-256: 92bad7e3dbc7867a85babc2fc03e1b3b28c70d232fab9ce6145f657791c0e0f7
font_02_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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