Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5050750e5388d26…

MALICIOUS

PDF

90.5 KB Created: 2021-08-12 04:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00d9940e83743cb11fecfbb353051f81 SHA-1: eaca73df9fcbd638e68f66ed5cf65418e68900a5 SHA-256: c5050750e5388d26d5a92a29e0892c3483e24fd9199f4981e4cc1a4b16816063
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. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed to lure users through search engines to further compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=the+batman+superman+movie+world%27s+finest PDF link annotation
    • https://hansenlight.com/UploadFile/files/xozilemazekuxa.pdfIn PDF document text
    • https://nevisnews.com/userfiles/38863800153.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e50ab98ae---50255372019.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/72889639880.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/perefazemipojus.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/83658eeceae0f67cc55695ba4ba5011d/kudigovutusevi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7d34994c---xumoxixalatasuponikame.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/11672296553.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/44666158549.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/3224582209.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/69471097366.pdfIn PDF document text
    • https://actor-conseil.com/files/file/wubebegasobogafodoras.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/zutikobu.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/16368067468.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210714144636_834846235.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffcf4ef5d4---rusiwoduwexepabitelogola.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/68423221059.pdfIn PDF document text
    • https://arerp.kr/data/file///38364763781.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/58a3435fd30784da988b010101e011dc/gixuwegobiviwivabolij.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160da78f0e0075---61845610864.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/litifunesiwuxixonew.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/38527689744.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/84455698268.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3e1f2c8b---17634790401.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/timera.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_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 17712 bytes
SHA-256: a16de8f629936de28a640a82fea0afe349670ebe9672d3b6941a2edeb30eeab6
font_01_sfnt_off00012797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAE 11152 bytes
SHA-256: 84acaad087cbfcd7e08544e41748c17a3be621e96d1eb5cba6029a70c1d37d0c

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