Malicious PDF — malware analysis report

Static analysis result for SHA-256 82263b2615099041…

MALICIOUS

PDF

85.5 KB Created: 2021-08-09 15:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ace5fc40281ca71a1453c1dcf3f974d SHA-1: 2e98398cc5251575f337de43a3695732ebf90ef4 SHA-256: 82263b26150990414b52409e9856bca40abf9e56dc1f41e67d7d169410f02d10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure the ultimate destination of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210623071054.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dfc74418c33d4e3e33962baaa4edc59/78070172950.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/mapagekikexa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d64755d5fe2---95983504619.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/87999581876.pdfIn PDF document text
    • https://nada70.org/userfiles/file/xemajixekewegez.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/51862246810.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/da681539059bc963ee39664d0a732c0c/65445987392.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/91b63c79014379f6cecabf457fbd2081/dekoxulubadel.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210727010947.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/munovuxiwixixixatabemedo.pdfIn PDF document text
    • http://4bx.pl/public/file/89766474844.pdfIn PDF document text
    • http://learningkey.org/userfiles/nanoxavuxukupumitozakopa.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/lajibivugo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a71a5969c---789757601.pdfIn PDF document text
    • https://dpmceramiche.it/file/22981499691.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e5d4d841d---74973385555.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/fikiwelopixuruzuxiw.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/basanakiv.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/53i5c57ptk25bu9h6454o0e44h/5822666279.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ouolabrrn97gleivjf10c2runp/93329377613.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7bdiklm4h8l5pto2gucnruugcg/12077515162.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5bbdac6ead2e7f70502aa0b9bd213622/8285602662.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/zinafun.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jijoxinawevonefig.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/58695109078.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/zebere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+augmentative+communication+devicesPDF 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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10828 bytes
SHA-256: eb91fcc30bbc19269c8056c92326771c9e9a25532259b24e80f8859043d1540d
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 16964 bytes
SHA-256: 718fe835fb72a956c08c85a781ea187a232ba6c6d0affec69ce6667b2f3d8e57
font_02_sfnt_off00012f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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