Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f80bc98001c2cb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-15 17:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d674792f940d11e473c804d5ba80829 SHA-1: 727965ce42622c3c09545b6a2162350ef8e5ea09 SHA-256: a1f80bc98001c2cb2dd4e2ab1657f1287dd20dfa7aee4dcc2d8aede9a9498089
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised CMS upload directories. These links are likely intended to redirect the user to a phishing page or to download a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://greenlivinggarden.com/htdocs/UserFiles/file/wekukodasaxofu.pdf In PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zudupexajulo.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/70152491176.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/mugenumokefapaniw.pdfIn PDF document text
    • http://zenkatsu.dk/files/67743222858.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/11131476975.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdfb3047c449698313100a435edcbe6c/24375575566.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/aa138c41ed5c63af7eda653232d890a9/ropudetinejozarejot.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/dugorokabutasovafo.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/pekitutipawepido.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/jusenuzodod.pdfIn PDF document text
    • https://quizai.com/uploads/files/61256992476.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/46874515991.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/33090420755.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/tigavopovikigepekadak.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/xamazedukedogajejinatam.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b781963c---8773714521.pdfIn PDF document text
    • https://j26clean.com/upload/files/84768818289.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e3a4bad6227ba2d67b037a1b5b30d89a/92781339817.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/94723958700.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/79436764184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+vpn+for+android+tvPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AC 10344 bytes
SHA-256: 4c1cf29b0b00f0a2804a7b29ab3f9d33d4a24cf2d844653504862081f12569a5
font_01_sfnt_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 21268 bytes
SHA-256: 77454d1060e4bbb0793f9257589ede303647b57f8a46dcc49cbeefba1de63ba6
font_03_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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