Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3a8e4b649ede1f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-11 21:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a5284717bb7d0912a541719f29712e8 SHA-1: dcc97e9c121eff5668a310a0dcf5a145bf45012f SHA-256: 5b3a8e4b649ede1f0c4ff2e50a40a6f74b4398d7c7218c23deb8164d910420c3
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6tn4jsiag54qb4atibr2bsdgh6/57444331495.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/xozogemefilifobi.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/50477833095.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/xiresifusevuzavimuxu.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/30994782847.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b5d21ade1---davodowi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/48335880469.pdfIn PDF document text
    • https://loctra.net/userfiles/file/74391798816.pdfIn PDF document text
    • http://net-work.cz/data/file/naxufozarikulubafi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf7241bf5---66044090914.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/87451584729.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/lasisemigorufut.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/dafukuzila.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/96117137818.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/mezoxige.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/no6rlo02hkj2j16tqiv1qo32l4/43473306090.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/wurer.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/tomiviwoguxonajep.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/87954694924.pdfIn PDF document text
    • https://digireg.cn/upload/seduximeta.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a265a90175719e53394af0d8de1c0e55/9719479265.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/gepakutatalivujixaja.pdfIn PDF document text
    • http://carbontuning.ru/file/wenufikoverizamobo.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/berodirure.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e1fd8c21330e9b85045c4f9a45bba9c4/93418904126.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210903082258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mindthegapps+android+11PDF 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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 17348 bytes
SHA-256: f93d20bde75f5667fbaa6b4fe83d8fc031e0059865f0c20ba4fe48829cd3c4f2
font_01_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 10672 bytes
SHA-256: ce8182b4d0a9796c351261b33f7442b7b1f4e239d0ea7d8dd118566544c73342
font_02_sfnt_off000133f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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