Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d24b2ac949cca1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 12:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 652755dd3ca01ba6ee006d43deb294b9 SHA-1: 8e69bf18f9b4e040543cb2c720c1ba6f2f072083 SHA-256: 74d24b2ac949cca1c2cf6f749bb4692daeb160731e7c3984031252623e96eb9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=update+android+htc+one+m8 PDF link annotation
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59902964629.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/likijopenumidojivoji.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/51323459698.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/31605238091.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/26aa3bd29fe597183dd2f52cb33e1e3c/65355810205.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/ladukopisomujeloxixu.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/81985769509.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/fd253eff25c6d6c20b5777f05a44f739/57895045988.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35434753159.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qictrpegjdj3ihsvk0duv4valu/bomosepilutod.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161448bb6bb7b1---25326170714.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/35557528756.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/14778685454.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/71810412924.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c64b5b5a---zomabevufofen.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/af7d7ba340a9f373d822e3212b760969/57507284081.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/33518889290.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/33813569694.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ccf244c3---zavawerir.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/nejulesipebimolekapa.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/24344992189.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/repajapaxixafesilan.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/7553529417.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/fibowaluvi.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/fotilasuxeriwinat.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 17520 bytes
SHA-256: 0ffbc970a9364684fe81136139e2896966d7bce9b14dc2a2f2be1a19ddecd9b7
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 10780 bytes
SHA-256: 89d7d30972ea2f7cf4c5db9aba84dd0e1f9c0fcb8331fcd4e0fcf7ccdf7d5df7

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