Malicious PDF — malware analysis report

Static analysis result for SHA-256 503aeb703be297b0…

MALICIOUS

PDF

84.3 KB Created: 2021-07-09 06:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5aa6e3351624333ffc7b976a0d4afcbb SHA-1: d14a0e487ee9578abe4a2164c4a58a28d120bde9 SHA-256: 503aeb703be297b0d12ad4a48eff2b643c5824e12d19c62af46bee7198b86794
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sangiorgioautoservizi.com/userfiles/files/logafitofijali.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/banelqisdnr7bga4of65u68vl4/79975451560.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zumemizu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160972d3a470b9---48733529792.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ja04uos13e0likpdsa8dh9p5qa/zorivupuminenetavozi.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216182119499134.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/uflfftc6ep3jcsmu7pa8k29tvc/zodalovodol.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7baf7e694d259998f8c9ea3a7ca304f3/43363700765.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b609ce3b2---11591677658.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/42970938760.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b061683dde3---fagufubipokuwazajubimoroj.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/zawoman.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160955a111d033---75235281843.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/j4ce1ga5ovpsfde31rnbdb8obj/nitunigazeba.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/beratawafusa.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bbab830e5de1f00d1dbc1154ec752017/59910368739.pdfIn PDF document text
    • https://artenika.pl/fck/file/48921985488.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/jozabitulizeliwonu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/70b33ddf6ebc19dcab097c555044fe88/nuxebejofiralugofixadoki.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/15197147281.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zakexirewesexiso.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/vimep.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/9vds58jcam1jun5kp285iqgj2r/relaxozupabotenebaware.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lewis+carroll+elementaryPDF 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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 16528 bytes
SHA-256: 93c0ab031164e1cea6e263d6b642b3079768bfe855fbdfe2cd4902f3160a6b61
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 10548 bytes
SHA-256: 8150a6887c67be46610d81ebc1581273fec1a4ecf8b1d289aac12820b6560679