Malicious PDF — malware analysis report

Static analysis result for SHA-256 886c924e6fa91b1c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 03:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a3ab34339f792bf932752f3dff72561 SHA-1: 44643f117977aa6a38c24a48b7859eadf77428cf SHA-256: 886c924e6fa91b1c34245aec726173de5aa1a36eb9cc6f13eb4ea251754ff8d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://queure.ru/uplcv?utm_term=peak+hours+meaning+in+electricity PDF link annotation
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b560a6a323a---gedemofikiju.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db345ce9a5---12575093110.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/9659573448.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/84625597258.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2af7a7ca262c288fed90c1047a411bac/45568513310.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/vemilonidunexuvurufera.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210822062500465.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/063dba34125b35e0ab80e7e1a8140f10/61917569786.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wazizopirotutasixozowopeg.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bcc921a6f---sitilakabugenezut.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/tivaxazesegufakotu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831585423d---30947780965.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/1691172825.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/59781148336.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/73816414060.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d9a63c8c0abf4be30ea085e467799a9b/wafojesujosaguv.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/40770420644.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bd8913670---53894258646.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/tavokugenijepesagaxu.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/94107954004.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/sadisevixumonezimebi.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/29302749046.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dce8a4e176---dojurizidijipivalokenufu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928e172d954---kokufavuvonisafupeza.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/34108945360.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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 10984 bytes
SHA-256: 2bd8b9ca531ea8eee64b7dba4d640d58f3ce5712dfc680cba51fb2659e477a65
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 17656 bytes
SHA-256: a01a3df59394464a3f249b34629e1d13b0b97511d53ad8484b6b667fa869c854
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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