Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc546d483134e8f7…

MALICIOUS

PDF

99.6 KB Created: 2021-08-12 08:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 5cc039f1bcfe0126e11cb5c127428ab4 SHA-1: 9b76ffacef8fd5d386551b49628758b886dd28ae SHA-256: cc546d483134e8f746e4033810ce9f746c63f03946e66ce20f01592a85e18d28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hamzsabegi60szallo.hu/UserFiles/File/xotepovemerebefonivi.pdf In PDF document text
    • http://mabo-meccanica.eu/userfiles/files/24028191612.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/10081080990.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/7651155366.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/jivup.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/facbaf87c7008df1ad081847b42cb45a/37266887602.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ctqi8jn6hd9v1bunpg2eqmf801/nusipozejewededuwigab.pdfIn PDF document text
    • http://funperm.ru/content/file/4380719409.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba291394ba1---jibesolirosibagidiwow.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jozoroluk.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b36fb6448---20640527868.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/45acc0af76eaa24f28c15e906d20513f/7937551732.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/kulufe.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b730b8ff1c---22941375472.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/59737084617.pdfIn PDF document text
    • https://bem-sa.com/img/file/pofemebosesurunaxek.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073544f84035---nasab.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/nevilorupufor.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089641f782ec---tikutatiturepakodu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7969cbf9---77066599445.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021080315481495245.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/pulejojupimobagovubit.pdfIn PDF document text
    • https://alutat.com/data/file/83722237374.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/dorozunidanidedofax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=arthdal+chronicles+eng+sub+ep+3PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 17716 bytes
SHA-256: dce5537ece2b1bfe1e63523c9d6f1a8a01413ddf194e21dc94d9bbc305133676
font_01_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C6 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_03_sfnt_off0001586a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586A 2668 bytes
SHA-256: 71de8ebfe10d1b80801476fa05e54e808151607a9959ef812d3693f6eed48e80
font_04_sfnt_off00016385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16385 11188 bytes
SHA-256: cc7e2e853f9c049205ed0b95e1a0cf856ccb0eabf5e9df043ccae47173a2c941