Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa52427a37a0d2a6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 05:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72bba966544702bceb38f8c89d8f8b9b SHA-1: 68494d2f96960c9e308ef305e9dfbb5c23b29dda SHA-256: aa52427a37a0d2a667e346e2828d596345ebbd6b29c9a638ed6e6d61bce99c8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple disposable hosting sites and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc8f409ee---jezepugufelofarubo.pdf, are key indicators of the attack's infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://vxclouds.com/userfiles/file/13114545445.pdf In PDF document text
    • http://ducthanggroup.com/webroot/img/files/remiviruvibusira.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e737c1209---jexudumikikuzepupezaguni.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/56285462595.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/vaxazosaxezovipumaka.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/5518668629.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/memobefedodopazif.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1dd687ed71c33bf8bc27db225157bbc4/27909903824.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/wimuzivinas.pdfIn PDF document text
    • http://tsydesign.com/userfiles/jws/files/gefoviluvaxoguzaledegu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc8f409ee---jezepugufelofarubo.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/85287731276.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kegademifot.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/zazananulujivi.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/vuxepuretiboxuweburakek.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/relegogasijanixub.pdfIn PDF document text
    • https://t2sc.me/userfiles/24664571821.pdfIn PDF document text
    • http://ping-property.com/user_img/files/saguwelevujotanigoribu.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/bemoru.pdfIn PDF document text
    • http://superazs.ru/images/news/file/goduni.pdfIn PDF document text
    • http://skupka23.ru/upload/m/94633243404.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f02ed16b5---magugoralasitosiwikimib.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/boxazigomigefatim.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/vasegujadi.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/66188485556.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/90666031603.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/nedezukenofefivijunuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+movie+apps+for+android+2021PDF 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_off0000bfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 17160 bytes
SHA-256: 7e09745918ec8a2ed2c37d4e92ccbdb59d48c401cd66f974df07a68cdda1a988
font_02_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 10852 bytes
SHA-256: 2d73d7d721fc441c1f438a28f4262d7fae64a185c4d700dceb9dccb54d0971bd

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