Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b3071bcff401ca…

MALICIOUS

PDF

84.2 KB Created: 2021-07-20 12:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ab7e12170cfd7effa8ac3c9466ae8ac SHA-1: 6714481dccf3716dd15ea3c98d549a318e1a5e34 SHA-256: 59b3071bcff401cafc00eb509cbbbd1b0d58a1d0424517695cad232ac3d2a700
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware hosting pages. The PDF's structure and the presence of many distinct hosts and links support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://proektasis.gr/admin/spaw2/uploads/files/61210077949.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d2b5e70eb45909991bdd3e8a4a3e4f58/44217859594.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/68869900123.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda46aded9f---76054276607.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d4c03a19---80915515221.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/dtnkkp29cpeujc5i1p3l3shakf/tipulagevakimodebumuwamew.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeaaaa944c---1522699372.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/tewatoxanevebomafi.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/10191223981.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16084a39bc1ee5---toreribobokodi.pdfIn PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/mawipodor.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e830d3e0ee5ea28a78e18dcf5bbb4154/saxiwatedewarep.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed4edeb74---72513556924.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6bu5sn5g17pkmltrumepotg5o6/89863870270.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c075dfedb39---47856661122.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/54484612879.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fccc6c5b9---masopekupom.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/perifavivu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a394b240f88---30295682026.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3cfa51b9bf924fb82731a5f260961cbe/dogarixafurufojevekonir.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608718c3db178---51325857436.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9cdc4fc6e---44988764388.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/68399206364.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5829d6135f3b1723f7984bb9e3bdda5a/62293566320.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083e19d4ead5---govepenonur.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/notodagopomubaganidefupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=grace+and+repentancePDF 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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 16528 bytes
SHA-256: c390375f2e56971eb9ef3aa5b4a840f5ff7e84de631ff5dea28675fdf923e12b
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5E 10120 bytes
SHA-256: bcbc57042987b1719619cfedf1c724e8a49acbf25cb49b8be239c232e127f1de