Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1b17034d78b169…

MALICIOUS

PDF

68.4 KB Created: 2021-09-22 22:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9608dff364c01efff44d733dd2b1ab9a SHA-1: f1bd47e278a281bacbcd74bf98d5a31e799a0647 SHA-256: fb1b17034d78b16933d817089c9c6b240bb7c5180db7f400660f1bf5bb5c5017
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed as a phishing lure, presenting a screenshot to entice users to click on embedded links. The links lead to a farm of URLs hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content. The presence of embedded JavaScript, flagged by heuristics, indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 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 http://4darchitecture.org/img/all/3430948782.pdf In PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/26296929826.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea7ec50262d5d0eda09d74c239e69a75/pemukoluzowamuxugikapafu.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/wejopulupofovawer.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/polaruguxivowul.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/mudikinonevefab.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/12042143927.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/18441718309.pdfIn PDF document text
    • https://virker-ikke.dk/files/liwuxewo.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/90163118826.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/vamoxigakad.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/zodunolopokuve.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/14724166247.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/89f12d2d3d7b2b68da18da7d61fa35f7/sotepojesiwonina.pdfIn PDF document text
    • https://tipresentoio.it/images/file/51525404946.pdfIn PDF document text
    • https://norservis.info/files/files/pazixofopoferatifarinan.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/56728033787.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sq0ai5o48ki3k4nbeks55524l2/91892322222.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/88097985610.pdfIn PDF document text
    • http://silver1979.com/upload/file/furulesolamopon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+see+post+in+private+account+in+instagramPDF 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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 14156 bytes
SHA-256: 40e6f21e1fa046aa9729e1912c149002b171966aa1d03c9d09c2af5f521a4fc2
font_02_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10916 bytes
SHA-256: 5c2947e574105e65fa62ac0ed4236a56ba6b36736449b1085f6a5fc393f6ba36

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