Malicious PDF — malware analysis report

Static analysis result for SHA-256 8151a54adfa2ee0d…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 21:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9b8c143f158ea99a89cbcbab45c5d0b7 SHA-1: 096f70eea061e289917ab890a135aaa4e6d35e7b SHA-256: 8151a54adfa2ee0dbba2bbb8b16083ab8f1590b17339027bad104215b5cc53a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and appear to function as a link farm. The primary purpose seems to be directing users to potentially harmful external sites, likely for phishing or malware distribution, which aligns with the Spearphishing Attachment technique.

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://crewmak.ru/uplcv?utm_term=arithmetic+sequence+common+difference+formula PDF link annotation
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/254c6577f26317b4944c0d99c4f9f9f5/lavobowatabibonad.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/lezasuzisijupudif.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/81974381499.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/tikazatozagewilo.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/pusojetazukeju.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7e9bcde7---99014610888.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/im1vt9s8s1effm46a870sju615/vunanarewedatopaz.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/nitisuvuwukawugabur.pdfIn PDF document text
    • http://centurionim.com/userfile/batiment/file/31740537598.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01a17ceb78a6ac31e54631ac4d2740b4/7978225029.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/vaboj.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/xudetalomiresonine.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/powidubal.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1e1711be9808c87a7e24cd41b6257ab1/laruvituvezuxojatiwulawo.pdfIn PDF document text
    • https://anjingliar.com/contents//files/35982827382.pdfIn PDF document text
    • http://cycling-software.com/files/file/nimonijumukurudi.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/bn1k8rju95j5pdj7c8jb6uu6b6/vopebanofedixizusuvevirut.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d9fe89bae21e9d1a90ab6fd172ccf97c/veforigutu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab4d1a0c1---87971315131.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/82173251610.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/jufewenojurelinin.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/448b691f15c41a0aab04232014fd7e15/fimuzifebo.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/kogugesan.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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 18216 bytes
SHA-256: 1927854906ab9c7b12a8925d9973d7098aef8985c40417f39ef4591ad6b71f98
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 10968 bytes
SHA-256: d7be230589a1eacb58397ab598420007718a914d7cea7518d015229e2c3d2dba
font_02_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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