Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4457929144be7e8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 21:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 297c7e1186373738fe6815126a9e6342 SHA-1: 1fec660e16bd750e49cf1bad935b91f4e9658daa SHA-256: d4457929144be7e88f125d8057ae423ec8aa1da92a6f84cbc16e43b552ab3a34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161337941d1ed4---58059318126.pdf In PDF document text
    • http://lunaleo.pl/userfiles/file/10322908407.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/semomepotipakosikupufonig.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d702ffdd5341e763d0174b14205c42ad/gegopizivuxalav.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/20a904f7f4636f9abac3aee3fec6fbe4/45835925935.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/ladodamipi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16131704089d97---76930731634.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/fepidifabomix.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/42284104220.pdfIn PDF document text
    • http://csp.hu/editor_up/bibuweras.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/zabuwolanabinizo.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/kusowogitixi.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/faxijujosoliz.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/jebifixolosepikuzedazorax.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161416f79684c8---fojugozofatumedufi.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/xubizopozamitirawovukuse.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lusoropelujalupiva.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471d14b88e4---87912303295.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/gamefifafebobatuleweniz.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/rupivotusukulusudejapeji.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/864j2j09t3ud0asufajn2er0t2/14685639965.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/81189459482.pdfIn PDF document text
    • https://tablouri.emilianchirila.ro/imagini/files/luwubumujusuxotonelezo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/17817178565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=naruto+shippuden+senki+beta+apk+downloadPDF 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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 17368 bytes
SHA-256: bba81c4d9e75d877711ee2f7cc42954ed5e49559e8628c8070cb8e2dc62f93de
font_01_sfnt_off00010e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 10884 bytes
SHA-256: 84f895db97b98854e68d4d51185ea4382e62e19e2087822f364c0e262461fac6
font_02_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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