Malicious PDF — malware analysis report

Static analysis result for SHA-256 e446e34a57548f55…

MALICIOUS

PDF

85.9 KB Created: 2021-07-31 15:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d5d179b2bc91b4041eb5834647eb6ec SHA-1: 45efefea24fc1a5f310b90bc1f7fec0239d67538 SHA-256: e446e34a57548f55c7e8ae7ec39e96402dac52807bd5e3d79f09df1e5cbe8b50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pk63oel242m7fcoo7omubc7a7c/jisaji.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210710/file/16258650596843.pdf
    • https://demircanticaret.com/userfiles/file/zisugupevalanonin.pdf
    • http://aep-tc.com/cache/fck_files/file/3835610250.pdf
    • http://harasim.cz/uploaded/files/45942479008.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/dabebe.pdf
    • http://matchedtubes.de/userfiles/file/68444930604.pdf
    • http://cz-synergy.cz/data/file/kusomosaresuxasalifur.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa6f269dae---73382614845.pdf
    • https://stratasphere.online/userfiles/file/32699738807.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9615dbae8---18842731598.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c517ea578de---92131062781.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e93485c122bc31f9e994beb1c8a932b7/86017632585.pdf
    • http://moscowprice.com/content/xuploadimages/file/pakegakelusug.pdf
    • http://kyanite.tv/userfiles/file/65868820777.pdf
    • http://nw-line.ru/generic/uploaded/36188487334.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tna9p5efs210acc3mc8hufhrsd/61038735778.pdf
    • http://rbtyutj01.com/userfiles/files/xabor.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d67a8ca4---varad.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2991d70b11---gojigol.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/3191854613.pdf
    • http://prinsart.ro/uploads/files/28536195330.pdf
    • https://p99.tw/pro_pic/files/9873641127.pdf
    • https://stijsr.com/userfiles/file/88776523021.pdf
    • http://rurisnet.org/images/file/tolixojedeloru.pdf
    • http://thaiboxes.com/piceditor/file/bamajebetibit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=whirlpool+cabrio+washing+machine+owner%27s+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9b.bin
4b24622959ef8fa10172e5d4bf75212bea515a8fb2436c8c2217dab45b84d5f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 11076 bytes
font_01_sfnt_off00010417.bin
b8c9031406e5e5a17b1b59624af6dcc72a4aa4fdb93f5d52ab336b988b15a89d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 17352 bytes
font_02_sfnt_off000131a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 16792 bytes