Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c4594d90ed36d2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 21:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2c0960a13ab3824b2afe939cbfd7ba5 SHA-1: 2054fabb72bf32bfa2f01032c109a018beaafbb7 SHA-256: 72c4594d90ed36d2f34c70f40345e3bdda539677dd7d90f0b9575169debd5e49
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary URL, https://crewmak.ru/uplcv, appears to be a redirector with a UTM term suggesting a lure for pirated content, indicating a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=gabriel%27s+inferno+part+3+full+movie+online PDF link annotation
    • http://sugarfree-gelato.com/upload/file/zakugesemabanol.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/38443210203.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/1344533300.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/28526079102.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614071bdca237---24435786877.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wubapexudamijomosijimul.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/2648140776.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/12531020497.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613777f737920---17730565967.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/zutugoxumebebapasisefoli.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/68734399194.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/2202376942.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kekebudowabifewal.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f781ad4a2d---fodagaziguxur.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/sedetapagelivulani.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4a52c34f175d730beed1f83c91637f46/39775299452.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/28807663511.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2eu6onu56dr6s6olshv1trcrv/82208215000.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/jitasagojifuvuxibet.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/64197531711.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vqp7jvqjpevclnnbv4crmipool/gariguwodu.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/45804737869.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/dazosa.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/39350814784.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/zigusamepilenogizisanusax.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161409cd7dec3d---memukebedoviniravovafeti.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_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 17368 bytes
SHA-256: 36739ca5f03ddad109a59ef905180061ddb914b5186cb2d3567e2e79a94344c2
font_01_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 11072 bytes
SHA-256: 927d54cac48b35c2e5e6fd92bfec81ab60680b1d6294c17032860aa92ae26aab
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1