Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfabf07ff418db0c…

MALICIOUS

PDF

85.9 KB Created: 2021-07-18 01:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3cdb1a14f8641b4e67e0072fd9cf9890 SHA-1: 9606c8434e1bb1f19bd5f8b7f4c0b840173a9fcd SHA-256: bfabf07ff418db0cddfe06bcbdbc9004778ef7e1c39cc1c383d24ca90a0c1f60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs and the nature of the heuristics suggest the document is a lure, likely for phishing or to download further malicious content.

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://cvsc.co/userfiles/file/vufesijo.pdf In PDF document text
    • http://fotossc.pl/_files/file/5300501062.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/9n5t87agpov1svk8496rcsrp3f/9090046866.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a08d0667777adc29e44892c3dd047f70/giwuge.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fh5blk4e32c7l9rh1e1lurvt2k/xumibi.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/samiwovifawiridir.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/4748552789.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e073c6d3e9---jinamexamaxexos.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/98406197882.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/30a7928ccbd3692ee3593e3d643e2e64/rewuselatulujinor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b14cdead8---48062697773.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/94116342014.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a67852635d1---medoraz.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/rebedokemoravurin.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/6778318339.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/vafefawixenosi.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/89623014538.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c940f2ae041de13e6a69e71973566f2/tedetisudedetenijofonize.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ca50bc1be141d1e6949877dd9bef1ba9/17901814121.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/xoxudekubananuk.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wasisafatu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/wuxesofiruvu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/163e0a75c340621f1191f0e9cd8b4a9b/babipomapewotizufamepu.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/kaxetaxileliwerime.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021052717131287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=searay+owners+manualPDF 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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 10456 bytes
SHA-256: 694bfebd200cf5405c909a294285fd573e88866ddf48692d7b450ac14c8faf12
font_01_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 17716 bytes
SHA-256: 6b2fbbce98c240944b0574ac00a2c678ca70bf7bba212c5beb1e5d979829339b
font_02_sfnt_off00013296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1