Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fc7f0303939046…

MALICIOUS

PDF

67.8 KB Created: 2021-09-20 08:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3818c355f717588a687cc1ed1d85829b SHA-1: 38eb82808596a2cb20ac3ffaa00b9c66434232d5 SHA-256: c9fc7f03039390469572a6c0aed16bcb3a4a7844fd087f1f7ef144a5693676ba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot used to hide clickable elements. It contains numerous links to external sites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://abwlondonblvd.com/uploads/files/29293754067.pdf In PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/botonibonimipimuvosozobo.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109072128082723.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/70748102437.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kesef.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/39980342590.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/24ac8a0c91162338e34c5ebd1573edb8/95485199464.pdfIn PDF document text
    • http://xprchemical.com/upload/files/2367755540.pdfIn PDF document text
    • http://hidramaco.com/files/files/42361933889.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/gemodejolowijo.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/8252258564.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408e05e6083---komuzojozesetigopap.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///75410293648.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/jadujazewolagizerako.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wugitokanitavowumosaposo.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/kufobedulab.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/wigovuwozavonukurub.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/naxibuxugamubafosagin.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/36646916042.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/letujin.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/povevide.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/43047613161.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/91b1d95c150c57d06169e8c0495a8635/12866047937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=characteristics+of+a+classical+period+musicPDF 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_off0000aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBF 10912 bytes
SHA-256: 7e2a5752a5c8e9411a5991232d9550a886e561113e5c8e9dea374d3355a63642
font_01_sfnt_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 13624 bytes
SHA-256: 4d136380188d8fa47aa24d40659844905919fadfd6c30dbc0a211c3423b2e617
font_02_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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