Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ba358edd0bcd91…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 22:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99da27d330d54f3e80fb27e6a683d51b SHA-1: 68f53ff7a34dda0f0511f1c0b7044967bc5e77e8 SHA-256: 58ba358edd0bcd91c2a9d219f1148e21ec1aaeef09b02644c0123ce9d764ede6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=xiaomi+poco+x3+nfc+problems PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3a80300c---juvirosakevuzud.pdfIn PDF document text
    • https://makenie.com/upload/files/19195980943.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/pigojizavumapep.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/26118720953.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/202191033695884.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/lobamipumotufovitak.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/zaxogegoxakewazomijoreb.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/kotewuzosabima.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/097bf64e4ada3ba15780ae4029eea1b7/60295384425.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/xekobonopubuvo.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/9850879164.pdfIn PDF document text
    • http://rivucota.com/upload/files/33892022515.pdfIn PDF document text
    • http://ipublicity.cz/data/file/bavogipufimu.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/86930355709.pdfIn PDF document text
    • http://schubert-hh.de/image/file/lagogidiru.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9615186600.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/wilalofewo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d0d831fe---65516990253.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3fcdc4bf---deretasodobaxizeku.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/lobijapemamugagewewutu.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911221508263008.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/roxevomegedesezadadutis.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/vabifonexesafokudid.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/28437238263.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_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 18320 bytes
SHA-256: 48254ffa95bd2a6ae4027794dcc3ebbc5157453c02eb244b9f4b52c95abc27fa
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 10964 bytes
SHA-256: 2e0161a2ca1711451317aada8907502ecf8fdeeca602bc0711c2a23fe512b2da

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