Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccff535244cb725…

MALICIOUS

PDF

123.3 KB Created: 2021-09-03 09:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e8d74773c3d17ca841e3397e1a1f13c SHA-1: 7340f99270f64f78e1251e401c4d230217792e4c SHA-256: 6ccff535244cb725c67598189b8a70ee26cba827e495a647a6fa324ba4dc013a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on compromised or disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9229

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://crewmak.ru/uplcv?utm_term=ascii+code+full+table+pdf PDF link annotation
    • http://ciaooo.ru/uploades/userfiles/file/22451325909.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/surabafujajiduxufikezeno.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dabbb6c19---31316086860.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/megunobole.pdfIn PDF document text
    • https://avela.md/userfiles/file/38646137259.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/1860146788.pdfIn PDF document text
    • https://ghnservizi.com/file/tagisigixerolajunek.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607d735b4da77---5778809969.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a66898ccd51---23536986548.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/2467618326.pdfIn PDF document text
    • https://lasanisports.com/files/55183184550.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/jexovuxelaxusujuzevulafas.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/bewokitovamejinunumi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bf75e643c1663cf4dd641e65e2075fb/58640226084.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/12241545799.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160945598c011a---89282546730.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/fesoje.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ragpbugf04f5vved7ufhfobjs0/rikimez.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/81857270656.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/67479a6d2a1c4d24ec9ec7c1b5211ab9/jevojawavik.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/22524748516.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611f81700f4f2---wanimevilezupegaxagamu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/40nt69v2n6rp34hr4gillrnt1a/42794142698.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210609_9F47446177BB818F.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/23987280351.pdfIn PDF document text
    • https://polaria.cz/images/file/81706669236.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AE 26904 bytes
SHA-256: 781a82b6c8472f1d955e05d3c142f3a80cca169a1dc645d873e2a8fd5f986988
font_01_sfnt_off00018f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F22 10632 bytes
SHA-256: 1144acf85cba0180e2dc47e826bd452714f369a14621683a640b0d51f2572d2a
font_02_sfnt_off0001a769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001bf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF7A 16260 bytes
SHA-256: 7306f982b18b3eaf606da663453d42a2e9f4c05eef2f8d4be0c059f61399b60b
font_04_sfnt_off0001d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D57C 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105

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