Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1bdcde4db96e1c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 05:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b2996da982408dd89dbf6304c6df6ee SHA-1: 63b8243a44a222963d37aa1475024143f320cb7a SHA-256: 0b1bdcde4db96e1c9d8e4cff22e948ea539359de60bcb78b4c9af14db5c7ad0d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many pointing to compromised WordPress sites and disposable domains, designed to trick users into downloading further malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://philabc.ru/uplcv?utm_term=18+wheels+of+steel+android+download PDF link annotation
    • http://cappellastudio.it/userfiles/files/lelefegejirebarowu.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/73765432065.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/78212578259.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/45086583160.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5ad0366dc75981483e663f2c033fd0da/51151255233.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cabc17bd8---22430228769.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/jexasubabalajenekejal.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/zilapi.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/tomajagubeporazosexari.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/98753501886.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/jodaguniwok.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/limonoraxojumunex.pdfIn PDF document text
    • https://huanghecables.com/d/files/28320964399.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/bazaxabakivakos.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/14365874979.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/givewasabewik.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bv6058tagal0q1l8fr8ptnnt1m/mumizo.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/91368923870.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/bulodalimavexadalazujar.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/zavunoxu.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/84743156226.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_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16412 bytes
SHA-256: b6eb4e9fff1dea833985cda2ab444cb6e3260073468a0ca24ed5e0151c3adec0
font_02_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 10700 bytes
SHA-256: 05c90de7fab755770adc71fbe72d2853270955315f8aa67529c1e5c351c86563

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