Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a28382a69eb3a7…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 05:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2c6d8734a8f3cbd1abb6ddaec8b5ce4 SHA-1: 61affe6ec5671f90df192e148500ca116616ccb5 SHA-256: 42a28382a69eb3a7285ff82a1ae7301944647c56cb2203b67b8fd400b6ae7f8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=how+great+is+our+god+piano+music+pdf PDF link annotation
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50d487d77---jelinetagop.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bovoebe2t6qjmi7rsvl6dffef7/mimajuwukifov.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0687827285f0e029b8898cf6aaaf26db/zoxisezegawex.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/wowem.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fad0c71b5e---48457251834.pdfIn PDF document text
    • https://jetaime-shop.com/files/68579721209.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608097ecc1bca---najoxerepanosejodijivonir.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f23e0ecb---7944799941.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vavalosinovibunonowaf.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c331a6e2c50998eb8d71f47d4b106791/vajif.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/91ca6a70f5674bbcd1e9aa661e1ab0b1/81116442343.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e300f49b57b---49670497822.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/66529069417.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/kubos.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05606b4afc---jefibupolafidazilatedas.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/37937355183.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966d1eed779---motisow.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/bozoluririmoti.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/wasufedexug.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/batajolapezakogimewaz.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62dc6a4cd2---95066961229.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac57e04df---50911374808.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/70743171189.pdfIn PDF document text
    • https://parkettworld.com/upload/files/zunanilowufopopajusadera.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/42318418308.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_off0000c14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14C 17704 bytes
SHA-256: 54579676d61e933a093ae20df83c284f2c2e24111cac086e4f9b5b1bbd14e77c
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 11092 bytes
SHA-256: 3b1ea61a7bebdb2244bdac433f92c20d77d4cf70a20c9eb24df343cf1dc951c9
font_02_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1