Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd42d7c2104d9d1e…

MALICIOUS

PDF

87.9 KB Created: 2021-07-23 07:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15a5d1cc53c5b66504ba79af4987a577 SHA-1: e9c65ddc52afb9626680525d12a3e1e86fd7fd8e SHA-256: dd42d7c2104d9d1ecec4c570c201f6ddd4ba8ef72dcb929842c839dd7b6d8ce8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, evidenced by numerous links pointing to external sites. Several heuristics indicate these links are hosted on compromised CMS uploads or disposable domains, increasing the likelihood of malicious intent. The ClamAV detection and ML classifier further support its malicious nature, suggesting it aims to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aymfly.com/aym_image/files/55671909378.pdf In PDF document text
    • https://namkhoasaigon.vn/web/images/files/galepeduga.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/xevezizelebabiviwada.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9089761f5---54966585099.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/kadaworexemox.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/5078483409.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/junalobidunijesikozexunur.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/bbb3f28a827650808534fa6a979ec6c8/70911462408.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0172bf5b55c09f2327a4bb4bfea1eeee/lodabixanafixogutaritib.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/tenofilupuwavanisonumaw.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/73513292254.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/1686423782.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/dulikineduweseguvup.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc2b2ac02---zutaraludurabadov.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/riturededonufowisu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb7ff60868---63446591832.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b65319ac05dce6b88f7caf94e53adab3/kizesotavokirabaxeminofa.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3hp6vri6lu2kp948q29c5ptst5/17799510738.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f0399e8f4c1a4647578a8fb1dfc2f00b/juzamim.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/22689230843.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kahskucup2lcvb5j371mlfo787/48834269678.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160794413282e7---wipumidisawarutiw.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/dozuzupaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=my+left+eye+is+twitchingPDF 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_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 16692 bytes
SHA-256: 8d1773602bff140dfb6bb7949aaab1bb05e14f9334b11bdc651ce2b4cf7a64aa
font_01_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 10424 bytes
SHA-256: 844466f83b226b941054b62bbc78a3f479a6bdf6fe8c8203c0eff8e4b033ff97

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