Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffc5ffcf28d0422…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 08:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9bb0e1a25209a1ac98cdcb831a01e71e SHA-1: 55a6aa8358dc41a27493c1e6733cb0c4109271c4 SHA-256: 3ffc5ffcf28d0422487aeefbd2cd75bccc3ae005ff76889da6065d482e722017
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through the linked compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=pokemon+fire+red+zip+gba PDF link annotation
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/85845222571.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396c4b91f95---vimir.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/sijajubeta.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nuvapimovurexaxukegita.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/98221998831.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/ragitaforevonepakikexit.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/nekekuwewusevudoz.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/vabiroverenexigezabu.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/bipumexam.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/wenaduranines.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/34580831646.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425928bb8be---rezigafefodidarogenuw.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/mixerifuxutenuwev.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f759f4235b---vimavomusafudunokif.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/22914784473.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/12405968bf1852d5bbdaa7655ed8363a/39460478591.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/porufimapifotokuvelit.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/bumevubuwejuni.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/45670190786.pdfIn PDF document text
    • http://consade.com/userfiles/file/nidanugoruwesipumofeno.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///ronutumimipudizij.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/wuvikegelalobozawaxilez.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/24051123473.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_off0000b6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DD 16776 bytes
SHA-256: e4fadd6903797f7e5b2f83a7f586e1b837996c351ccb76bc9be37edb281e678a
font_01_sfnt_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 10820 bytes
SHA-256: 9e25ca68cab831d3c990e6c68bce0afc5f65676a7e156471d516034351f96e0b
font_02_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1