Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf0ae6150685246…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 10:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fcb6a727c13c77e2f3ddb2877fab7b7 SHA-1: a9827947670dcea15b395196380444a25bc6c01b SHA-256: cdf0ae615068524688545fce49223571a3fbf27ce8ac25c43cc6153c1668b47c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=android+apps+horizontal+scroll PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133481eae5ad---xurakatusavusezapo.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/kopoko.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/fixizovotiroguge.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/4075319915.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/p4u0mcf83v598891qfo1dk2pg9/57383654302.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/23360563501.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/63190222896.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/pizewajufewabudigulowabe.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/14963704872.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/89216328679.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/87124088187.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///52982232234.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630920693.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/80946553525.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/89772286388.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/53996325317.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wabovuv.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/zawabatidepomumelilix.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/lasafoluzanipometesodoxu.pdfIn PDF document text
    • http://dnepropress.net/files/file/96357314810.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/65767597139.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24950856907.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466a1533401---getemanokavuzel.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/xafezudowuvumemapum.pdfIn PDF document text
    • http://besteva.com/upload/files/42699552824.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_off0000c079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 10520 bytes
SHA-256: 71d93221dee931c287e407130400dcd2a0999196eb452ae88fe2e082e8ac2c90
font_01_sfnt_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 17692 bytes
SHA-256: 02d878fc98932bdd3c919e5013f3e67f4349a4133c77cf545df167f6d884aa98
font_02_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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