Malicious PDF — malware analysis report

Static analysis result for SHA-256 e624336ce51e8673…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 00:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df2b396ab7fc16db00268bccefd8d194 SHA-1: 454484c9c9f5c7674b45ba40e98a2d28aec44967 SHA-256: e624336ce51e86732f89f36b07379427eb4e4b261a83a0e3000841f1ab4e4e01
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to these malicious sites, facilitating phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=prince+of+persia+2+the+shadow+and+the+flame+android PDF link annotation
    • https://123natura.com/stockages/files/64480303384.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/15834693372.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/98710742210.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/13669629008.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/67261113450.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/36335622420.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/mibipidukekanazig.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71b7addd3---bopalisuravisodukuz.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/aa2040943cfc8f04b06dea7e619992ce/16565130754.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/tikobakufodotatukojom.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a462eb176---52612546355.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161325557b0f3f---retonikatarefu.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/47977781475.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/hk0ukubvgp3poc7ioars47sn5t/6032389457.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/72072974037.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/1861823699.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/34898376244.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-09-18-08-29-28.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148f8da9ac98---wezoxogoruwugaluxuxufi.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/28717003203.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/27228116271.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36212725086.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/37969626521.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/golamazinubute.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/96782826139.pdfIn PDF document text
    • http://oilspecchem.com/files/gonujopoxibisatezo.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/31145029634.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 17656 bytes
SHA-256: 54ea8eace02a0f72525fbaf2cda520a016fe35861a17c7164316ad0f22ad2995
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 11092 bytes
SHA-256: 9c4e80be59afd13ac3a3988100b5a048d8984e6cf2f0791a6ec43bf305a9e757