Malicious PDF — malware analysis report

Static analysis result for SHA-256 f597b60f7951a858…

MALICIOUS

PDF

91.1 KB Created: 2021-09-02 04:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f1f862df4b9e8ef3345e35a05545a46 SHA-1: 26dee52d7a84b9cfa197067c29198fc0422aeb5e SHA-256: f597b60f7951a858f7a7a0b6718edef69f8ac2b7fcfa96976042c398b349319c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting suggests the document is designed to redirect users to malicious sites. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=red+discoloration+on+legs PDF link annotation
    • http://edu-family72.ru/content/images/uploads/file/96409989422.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/22814823028.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/cq573fqg9ujnfaipf34okn0bi0/pefibinoxili.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/0up92l8r20ncjko71ijks5me31/51838161074.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074a488ad1ef---73330978843.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/zozuw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07c231bdb1---99346660642.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/raxag.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2ede5ba55a1132c1d2ed488f84a82592/35454590736.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d068862a---kodiriket.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26aa39e69---9363240910.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/jowol.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/luzofurotupodulemede.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/28025841152.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/zumizeruzokojiniru.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/beniderikidadidakutira.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d95853840---58477559767.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/rinux.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xutewefatorijizigepuna.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/mezavigalorotupus.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/80628785116.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/nujalufunulon.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/34928067632.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/tumofemonavobizavafipeta.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/76573077710.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_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 17688 bytes
SHA-256: a0a039146d39769cbbb0b1b5f09b14f6f949ef9d67f232ab951056f5c7d865e2
font_01_sfnt_off00012dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14611 10588 bytes
SHA-256: 60487d73d403fa4fde894166ee40e0c4593a96bfc6ffd1f20d9693b4c6d297ec

Open this report in the interactive analyzer, or submit your own file for analysis.