Malicious PDF — malware analysis report

Static analysis result for SHA-256 224b60fd0b2fbea0…

MALICIOUS

PDF

80.2 KB Created: 2021-06-25 17:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7567ecc6e6d422fd1ce827b405d7ba54 SHA-1: db3e1d4a46d91258c14fd0ad7ab0d215b40a16bb SHA-256: 224b60fd0b2fbea05a333f15efcc1e5b0d5f54654b422273824f1b644ea66ca2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c1f6539a8f85358585a012ee4c03e5a5/20093428103.pdf In PDF document text
    • http://shinies.ru/img/lib/file/xekatiwer.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/72427265872.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/devorugedogezofabuja.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430153532726763.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/6tk4tf5knl9fvn3m84l2tpqep1/8942974775.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b3dd2a53754829bacca5e47aebec8809/kekaxal.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2aa02c42b447ee4786d544402c5a278c/62929223020.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/19943669473.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ddb32c39f4113cb18a0131455ae3253d/ribunerulodetaveduzote.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/xezegozofesezizu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607536b949d9a---sazej.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/rusutofavuwatewalosuteraz.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ggg41e14ov5tug9ma2990b1uj8/22586489087.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2b4b484f6---mezetugonixarexapop.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/99019843022.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/51208289025.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ru5jtghgvj1gkd93d7juqtnlt2/36067883102.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb6a7ec4f---lekinazomup.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/86ef28c9407e6c343f419a87dfab6f7b/19745691048.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/jexirikerukinovikitis.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c39e31f4fbb907955e652b019ed99357/fibawijalekusoxokama.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/94387436432.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ud62bvnbrsuahitohqagme2kcm/48220024401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=stratified+random+sampling+with+proportional+allocationPDF 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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16872 bytes
SHA-256: 3daf0158c91b2e6e7713b6065894c24c7965ca3de87598b133926012fb9e180a
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 11228 bytes
SHA-256: 42dbd3634628fa29858a8da760144191670900f50d3ae91733661b9ff2d6868b