Malicious PDF — malware analysis report

Static analysis result for SHA-256 c547030f0866ad35…

MALICIOUS

PDF

79.0 KB Created: 2021-09-15 06:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b547c79488e710c81973a30860d89a84 SHA-1: 4ed1457a3e6c8e8af79f71f6bc17e723fb768c64 SHA-256: c547030f0866ad358188ae10ce4b70ae50c8d9812e58dc304631e8a198c703ca
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest an attempt to lure victims into visiting potentially harmful web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://thebookmarkcafe.com/uploads/files/raregutu.pdf In PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161416256b2ff7---67846091990.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/82201621504.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/felelapomifo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/45a220ecbf9c0ea68ffd845069a53411/98475958997.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/zopazirapubus.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/jurumimokokuje.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/64147850795.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/6775865407.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/zobolegujenevagis.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/tuwavupubugamexagutatanib.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/gifasafakukagufol.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141433e77ae4---bovapimidez.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/29785970127.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/3590712928.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/987c63141c9a450c9303aa30954f06b6/76783562308.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3ca74333d61f43c37bf10ff18f0e1b44/7708114542.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sifomeluwiduzokiv.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/70054815923.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/penixuborowopepakojidig.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/valibefewadedifesu.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/84233859080.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zedabebovisasa.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/xegog.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131692070b74---68193400562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=los+angeles+crimes+androidPDF 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_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 17496 bytes
SHA-256: 543249a1a32b4d48c6e944dc513a4d70ad6d8adddc0b53f64943039c10005307
font_01_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10572 bytes
SHA-256: 92ab297e749facd13a96922a2d9b9d14c4274dfe19df40748fa583918a9a7f7a
font_02_sfnt_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1