Malicious PDF — malware analysis report

Static analysis result for SHA-256 497fac85c50ff404…

MALICIOUS

PDF

77.1 KB Created: 2021-09-10 21:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41d732aae06c9950386f5e48a2e46587 SHA-1: cb65b6396a3cbf0c00b394dcac0d979f6454c868 SHA-256: 497fac85c50ff40479bb8a1a1cbf2d635befac249992e674831f47edc7589d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The presence of numerous links suggests an attempt to direct users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a2362642cbd6917e3dd3c79af1f35415/20589419061.pdf In PDF document text
    • http://prime42.ru/userfiles/files/nobaboxaruxajorutivop.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/42208101920.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/94077837027.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/bemesujakigoga.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/27451031390.pdfIn PDF document text
    • http://wdnederland.nl/file/89724595945.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/80588104627.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/gurinuxizap.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/19de46b3066ee21265f547ffaca48477/kalofojomexutevux.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/xetoxat.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380d7d69242---sabofudu.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/13392217397.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/33959869433.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4kckpp2fj2ct101arh8rkfj5gj/50344177210.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/nibupisisutobusazafexo.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/59284591916.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/4062090233.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/69066277660.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/70697550811.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/segapasezovat.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/javiwinepurinolagusonopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=react+native+android+background+servicePDF 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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 16772 bytes
SHA-256: 90f13da502e54acfadb98c3843be38519f9f3ad83684ec64a93f840c5b103ca4
font_02_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 10944 bytes
SHA-256: 64a36dbd21d874305cbe18497552964c69c4533cde6408f421a9fa6e10d2cb54