Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb8f62cca164492…

MALICIOUS

PDF

102.1 KB Created: 2021-07-13 23:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec78f8c5cf5f1536a1837d2d0f0c29c9 SHA-1: aee460cc969bf6e640c419c7bd6a01729730284e SHA-256: efb8f62cca1644926e1d8cf8f7c239973dea86434710aff2e5066590b5019293
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3c1377c2865bf99095509f2bb1e559b9/sigajakinoregoti.pdf In PDF document text
    • https://angelsforwarriors.org/userfiles/files/kawuzijudovotekefuwuneziz.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c7e1a633---wimamegifutunos.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160968aabb9913---61814971732.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc0eb5a039---tuzarogazilogabovuziza.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d58454fe5---lufoliro.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c345a0d6c17---ladateta.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2e953b3e---kojijul.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69703d8bfa---dufisidusavitagujomete.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/fogorusegosadaxa.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/jebopejudukasupidoj.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6ma1busm8dlnlg0o3j2l48np2h/28373469882.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/dc42fdeffbecf77533908036c45c18fd/ketowixumaberetuxivurale.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/20980569050.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/cr6si1nc8kitcdis6858rhnpf6/rosixidomegimuwuzafak.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab443ae008c---topivaliporimotevefe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c24a84da488---19668311425.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/52803978382.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ad496466ec5b5f1aa6cc82e7b7cc739b/lapewiwexobojane.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/dowusebibakoje.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/nanomineba.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/75nvmau7c63qksdft45v5k0pf5/47887591647.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a754bf605c4---79984450835.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/86270792065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=synoptic+weather+map+definitionPDF 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_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 18212 bytes
SHA-256: 06b0b6605bb999d7910695327dbdfc40cfd361a91f1ee072014e28e7abcc4d4e
font_01_sfnt_off00015994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15994 10948 bytes
SHA-256: 9ef9aed2c79ff6d29ac97813669fa2f31d60befaf7c32865bc3a3d304dcd13c4
font_02_sfnt_off000172e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1