Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7fb90ed35f3221…

MALICIOUS

PDF

84.3 KB Created: 2021-08-01 06:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c394e10f69efc57ee4490bf0c8d079d3 SHA-1: c21607e3729378bd776c45a140cde7129711356b SHA-256: fd7fb90ed35f3221daee87e557bed0c1aaa93a184fada943aeb8f65101c16c73
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of multiple external URIs and link farm heuristics strongly indicates an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=the+astonishing+color+of+after+epub+free+download PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eb081fb9b---muxijonigoje.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/11248216213.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5201603e8c---79201079725.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-1/20210501004741651753.pdfIn PDF document text
    • http://crm333.com/documentos/file/vozexunanugolobusopeb.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c5288ee818e60f51b832fc949d4b0740/35846699176.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094729137f77---veworufaraw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5456da037e1aff72d2e670c44e4a1b9b/7502713440.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/45049713155.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/1323071436.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/nukilokew.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/ruwefirutibozovofeto.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e73b130f---fojidoxabowon.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d56a6af7d---faximipesa.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ckl18a29n98p2rkokq7betpghc/waguradeduzekoper.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/12268303180.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/19053799050.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/junor.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/156b89bc87beff31c27f1b0359ab4cae/sogoveme.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210519014339.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f8936a0bb---39563114952.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69c6c6ed5---85683381342.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210723155417.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/12701945221.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/59335862438.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1a11af991f707b6315671374ae488435/tanudijufo.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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 17360 bytes
SHA-256: 362865ae115d85416556bd38b487e770d8d6d352ea58f1c4640d780090cff144
font_02_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 11188 bytes
SHA-256: c692d96efd841643fadb6bf3f50d231f1cd00c0f8fddc6184ce649d7e30b1fb6

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