Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7560f88ada2290…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 09:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac62fb0af7232d679d742a0d8da6d6e2 SHA-1: 3816d7a4938029c1a0f050aca7d0b15e564f69a7 SHA-256: 2a7560f88ada2290a649073a465bdbd54af29e9fab27d9f365ec5fd89cb609e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm. The presence of embedded JavaScript further suggests an attempt to execute malicious code or redirect the user. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • 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://dallaslandscapedesign.com/media/files/85422928771.pdf In PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/jivavoze.pdfIn PDF document text
    • http://sergeybazarov.ru/file/barewebobebasawiju.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/37371759638.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/lanox.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/12027283472.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37683f0b8---radulute.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613326d54fa19---51358655964.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/50301013654.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2893bdc5f67a4ac0ffe42533fd917dec/74813845850.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/75951823010.pdfIn PDF document text
    • http://mfcpavpos.ru/file/45098232349.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/46205020834.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/pazisilef.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/fuzuvugewopivage.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/gobexerezilawilisokogarap.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fexosafirekofevorenewa.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109091448538636.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/goxapagududadija.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/41978225500.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/wixufalalo.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/31002408889.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/sikukutomevigukeweminome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=time+enna+boss+web+series+watch+online+freePDF 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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 10792 bytes
SHA-256: 53314d3583aa4d33641042ba41ebbb195644d167b6b135049f12d5cce2f837ec
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 18048 bytes
SHA-256: 22a965c3f3ccdf5cbfed951a4762e02cd86094427a8e94c707b91cd1c4bb9087