Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8ac2d0b8e6f6ec…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 21:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e2837353c980144da6438a1f75bb3b6 SHA-1: 4836fd5d99a9b7d087000ceb0bf837fe77d073cc SHA-256: 7f8ac2d0b8e6f6ec93bfe4116eb8292f35bfb81256a4bf09ddb37926912006eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=android+3d+wallpaper+effect PDF link annotation
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3ftqco3sl5g5a6n0qbn4btj4hf/sulesunowilusamokalov.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/49404710514.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/99463526732.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/nedafinetupevuwazulawivit.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/jizom.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08ed4eeb9---fegikidanalaged.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1cdcd1819763a846a3aa10eece41fc27/gedomena.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/febin.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/80843432156.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/67134251764.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161453945661ba---kuvewijilobeto.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/65412488577.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/85111100158.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8275e8de8912acf0c5cfd1e911dbfd3f/pedot.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/54449216501.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/4394483883.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad55e68bf---xalon.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/43759120207.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613584d1c524a---kumizu.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/52882575845.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/69496541054.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/denufiduzusob.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/nozewujogudelarita.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/lozevasusiwiguvigezerul.pdfIn PDF document text
    • 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_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 10684 bytes
SHA-256: b1ab5a7ebda6f30059f2e8002fa056977bade754ea9b32b42c432a68aa381300
font_02_sfnt_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 14548 bytes
SHA-256: bf381dc16e7e18593bdc43ebd74d049842921882d0f74dd79008871c115a740c

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