Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f677bde9f02ed3e…

MALICIOUS

PDF

101.0 KB Created: 2021-08-24 17:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6b9e05d16380208ab724f3597a9f29ef SHA-1: 6169d5ae6c7b17bf64999f7e111aafbe71ebd20c SHA-256: 1f677bde9f02ed3e6edf9c06fb7ce486ff1b650af61b1eed6e7024c5af570edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=the+meaning+of+cocktail PDF link annotation
    • https://alpinashop.bg/files/jiwawuvagopurerelawized.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/49672668377.pdfIn PDF document text
    • https://castel.ro/userfiles/file/35202372672.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/fdcddb71719031f410e5323c08757a0c/kivelevuvuxugo.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/98139574885.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/56747679260.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/70918307383.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/rb26ifs6el9bcg43cfg67vg3pp/15074803755.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934a1e38cf9---98842000580.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gafmqcckngeajbtch7g03ib826/nixutagisixakabu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a68b9cff91---wenedoxemigugo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae6de1fa75---60576363830.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4440c791a3---19672159097.pdfIn PDF document text
    • http://i-dron.cz/data/file/8154333280.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/nujuneretok.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/biputudokad.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f132a05e9---91657264484.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/luxide.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae0a5d0ab---64926477754.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ikatolefawaro.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c259e7414---zubusubevozewa.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/pozekesumaruxaxivujudegu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/o74c0fujk4ugeo2an7sf8i2865/71565972198.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/63839836434.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/64211f32b6789c4872786322944d2815/67272700327.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa19bf380---dopaxibepa.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ea4f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEA4F 19120 bytes
SHA-256: b63f9be29c06f2264a51be64d38737d16d371d945af99017e51b183a5f87f0ad
font_01_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 22976 bytes
SHA-256: b49cadcef3e27674cd3fd51020cec3cbfc3a83c3d60dc34f19fa5e59cb0b4681
font_02_sfnt_off0001421e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 10572 bytes
SHA-256: c112df510bcce35a769a1044f981f212c688e362acc3eadf96c2a2c531f3bba6
font_03_sfnt_off00015a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001721b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721B 4540 bytes
SHA-256: 44e67564713963ae4afd92680f524c9cd99ee08415df75a1149ff8e7db51a5fb

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