Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa8cd77d8633ffa…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 03:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2ac15d55e54b69d07481aca0d6cbc81 SHA-1: be13f1b9056511ab0a78cf702c58026abba878cc SHA-256: efa8cd77d8633ffa2455ed94628e343fe86a5c675c547534776427830d26b92f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users to potentially harmful websites. The heuristics suggest it's a phishing lure, likely using a screenshot to obscure clickable links. The embedded JavaScript and numerous links to compromised CMS uploads and disposable hosting reinforce the phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=frp+bypass+0.1+apk PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d0bc068194ead4078bd5816f46a83ca1/11690413551.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/4567911747.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/golamilovu.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/94959613853.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/derudemaw.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/18158591998.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/21263062980.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_505EF930B478F397.pdfIn PDF document text
    • https://hssanesteban.cl/files/luterotilaligafasuvij.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e5edf6df---tirubapa.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/74566214113.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210925_8BA59A7294D02150.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/84741484888.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/tideva.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/rinebalonijilakorelofu.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/48177086169.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/3281378394.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/sevufutanipubojifivuju.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vomipoze.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/janatu.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/35396153857.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/suweporiziriteb.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/49405009231.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/h707nq4v902centt5p29pslo98/80703711581.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/20073500442.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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 10216 bytes
SHA-256: 6bbb20feee760752233632363a35f8125a401e376dabf688d6c4bcdd07f95bf4
font_02_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 14272 bytes
SHA-256: 95e4c245715c28a75e34759f0b548d43eaf12572676dcb89545029e7d45c9f3a