Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b45ba2e1231a8d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 04:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bef7200de70160054ad231b0d1a28335 SHA-1: 52eb159eb7d99da78137457f2ea3e178d9fee2de SHA-256: 28b45ba2e1231a8d4a775ba78a1cb739ff634fb3486d73773f715afa43af9dcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains, likely to obscure the ultimate malicious destination. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://akita-inu.lv/www/files/files/72007642132.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb37c7f58---42522179484.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/nukig.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/jozidinuduligefademovej.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16104d3bca8fd0---faxavizade.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/zerisemixadori.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/elf4ht0htpvi5sa73etmha0c5t/vekufipexezevasesos.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b4a419eaa69f23320ae1cc3754097091/wubanupibumaxokeva.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/78016294221.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/16749629355.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/fepuwokawijagilekavuziv.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944463b7580---gelakagowub.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/113415b62c0050586b0120f89c29bb47/28384464168.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/mirupupizavufokate.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7369be1c92---28076746772.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/42877992134.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed32df3490---33392046193.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/30b34fd82b0b6aaf360b82ab278588ad/juxivikaxedekurukavafij.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4am7ev8fl4cco628eh51kpv627/mirepakobegibigujepuw.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fexuzatijesuratuguxi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a85e00029f---dubelulebaxabobe.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f5e27939---22190821515.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3242e43b---vonubudatemipinijajubuxo.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0681632001628837866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=comprar+livro+vidas+secas+pdfPDF 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_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 10676 bytes
SHA-256: 352aab873ddb0f27c5fd36e8123c24ed1a36e7b8c334060cd5be786105207ddc
font_02_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 19872 bytes
SHA-256: 0622c990fa41aceec8abb9ccb218743ab681d73bfcda1170d341a3d2a77830f2

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