Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a733044497de3a9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-25 23:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96bee0358ee1e32ec3aedba664168062 SHA-1: db8b27d680ff56a7f0b78780ca409f60e1765582 SHA-256: 7a733044497de3a9a5ebe19770722afaa680d606266180260494d8f8363c57d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malicious PDF, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://serrechevalier-skifun.com/imagesfile/nidogurefez.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-18/20210918041502358629.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/87449041144.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/54372712788.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/lovedolalaxazexo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/45450072303.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/21652349623.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/mepowijo.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/bedekujimojow.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/31883220213.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/8925954523.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e6df4596492d2b287c6674f41c66e720/10283041250.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/21969843418.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d4b555abc---banavefedoror.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/gutiliduwozilovebevofabib.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f7e8dc21bc98948f78392ab55bd50294/72387380475.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/magirelekadefima.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/mbva1bknvo754dvr9f0i74jdu4/1171461126.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/pafirik.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/gazexevito.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/3805273174.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/36260753428.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b3e9420c---54765957333.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/mixev.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/51789766658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dragon+ball+z+episode+189PDF 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_off0000bb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 20024 bytes
SHA-256: 8c7882607f5365838a52270ee3926383e0c2dd99d4226ba64a24d750466d4b24
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 11096 bytes
SHA-256: 7f5fdbfc687e30af85d4b68cacf4793ba3732303b61f86dd06dba72b9fb97671
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1