Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cf05e71618663b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 04:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85c35436b24d1ea3ccda8aedbc23f24a SHA-1: 99104afcc3b7fda3a1283d54f0877ebaad825c5d SHA-256: 92cf05e71618663b6c7822ad75b410f4c23a15cc194a092d269b9c05100b1914
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many hosted on compromised WordPress sites. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution lure. The embedded URLs suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://klimatyzacjaradom.pl/userfiles/file/41920646254.pdf In PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b649b60e63344744a081c418c5b011c4/10443807939.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ce9df12a---redepalodezeniv.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/86375483176.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bebcb3a78---14967990070.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/moridufalivi.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/53114742442.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635fc04884---28608736834.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/70560064860.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/9032045009.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/ximaxuzunujejixenuruv.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5cf61dbd6dd6b5f917aef7464f31101d/refegomegasuvazefo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a1c27fa00---lodobozitudirafegutideja.pdfIn PDF document text
    • http://vhshf.de/File/jegugojivapedupefapevil.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad80884bf1---belagimare.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b7b37115b---befisufanabimidofitugofe.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/1567716236.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hoj3oqe7kngk80slk082dtuso6/99110868331.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/lipuranuvojuduboraridukeg.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070203537497---2934587957.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/a8867fef826be7a8e66792e31600f325/47087321270.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608896e442344---jumux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=2014+dodge+grand+caravan+service+manual+pdfPDF 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_off0000b73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 15956 bytes
SHA-256: 19701c6772e730aa6f9d4367b9637d6665786c82722b30b7b237bb9c2e36ff3a
font_02_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 11308 bytes
SHA-256: 001a9a69f9a41f21936055bdd26fa6be782757cc1e2b978d635137813895278f

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