Malicious PDF — malware analysis report

Static analysis result for SHA-256 da29c6c54e5387c4…

MALICIOUS

PDF

68.4 KB Created: 2021-09-12 17:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5cbe9dfdd42ca15110a8b307e0df96a SHA-1: a1f53ce63c58d81764cfa375ac9cf888b1bf70b8 SHA-256: da29c6c54e5387c4570ad13e5e62a012849fb7bc324da9afd784087ae77c562e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://sendedianqi.com/upload_fck/file/2021-9-7/20210907095522205408.pdf In PDF document text
    • https://atrax.hr/files/wabovebagam.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/14438248784.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/32022116941.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/jitovudonivaka.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vakojiza.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/40334704764.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/tukazenaxunemuvozeg.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/42124022751.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/wukanobamujemovojis.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356c7fc045c---29069470403.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/zanirunirosuvokun.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/nutelemonemufufojokupexag.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/48601718075.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332b4fd2624---jaxazobo.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/digamuzegodipafagomamib.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/725455f567db94715d7321632fe4435c/56898993121.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/76980806790.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/65319973511.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wusivuzatewu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136479311af3---vutodu.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/43195672184.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/vugituwenaxe.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/mogejevevuvumavon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=maxdroid+gta+5PDF link annotation
    • 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_off0000b21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 10204 bytes
SHA-256: 5274b78ad389f7c7197ac815a5b73843b04d76a74956c7a6c5e2ea1c4a7a7625
font_01_sfnt_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 14368 bytes
SHA-256: aaa7f67ec797346e4464979c7531775d197a55c5465d6f42dd61790183930f50
font_02_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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