Malicious PDF — malware analysis report

Static analysis result for SHA-256 319a8c01af3b3462…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 20:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dc68af54cbd5c0cccb47efd0fb1d892 SHA-1: 0332fcbbbaaf04692a72b10ee119e3a94135ae6b SHA-256: 319a8c01af3b34625d397f744aefec78bf14fe49a0c38490b939dcb6ec1982c4
96 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on multiple compromised websites, with URLs pointing to PDF files. The presence of 'utm_term=download+getting+over+it+apk' in one URL suggests a lure to download a game, while the overall structure and hosting on compromised CMS uploads indicate a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e87d636f6---dazogajilemogezaxiwazuxi.pdf In PDF document text
    • https://walkandsmile.com/userfiles/file/sivufubotigusakurudix.pdfIn PDF document text
    • https://rajaunited.com/contents/files/16746626645.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/57454397992.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/zosusikulewuki.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210908072021.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/86455366797.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613878954222c---93160128628.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032e40654e---11319150969.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/janirogijejogew.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161470cd616c00---97605303107.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/pokuvedowasegapopobibodu.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/58856222745.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/misusozoxukefuzadutob.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/fasegoravuderekejusu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614278eb2681a---dekirukexuribi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dj8fl6i78emtotg9sasbtjmaj1/minawifakifaditavelagotef.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/gazuba.pdfIn PDF document text
    • http://haki.vn/uploads/files/21405218039.pdfIn PDF document text
    • http://retailcop.ca/files/rosizedej.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/lutamusama.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/60090441353.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/wunava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+getting+over+it+apkPDF 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 10644 bytes
SHA-256: d9b7b3c6c9006a53d6e322dce1ff49db6056ed8dcf55e16d68809c19eb6c30aa
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 18336 bytes
SHA-256: 7f50f33f064714ec22e39eb610b2081fd6b1b3db04fa83b99689fb5fcef4ef13
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1