Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cfe9905574fd56…

MALICIOUS

PDF

79.1 KB Created: 2021-07-20 08:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0ad34cda655b4baf7d33681aa34504c6 SHA-1: 68a1f633d59b620e14f279b7fbeb934ae0ab326e SHA-256: d4cfe9905574fd56cfa7ef61171ac8c8673b14a31cfeda6438889af68c04a9c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true origin and host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d140b6eb---52454846975.pdf In PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/57478570922.pdfIn PDF document text
    • http://polipack.ru/content/file/11141934751.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c665f6dc553---vamijisuwuneraru.pdfIn PDF document text
    • http://ymmicro.com/files/files/22280435193.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e5906de75be---pajizujesusalomogun.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/tezozuje.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f719c0362b2a36203f0de93e6f34c57f/75805681291.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/89014995062.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/93754324167.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070be3ce9164---linurosoxijajogigujarel.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/3873155386.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/47209b9abd05c3c00184539b7e098e9d/40560506993.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/gegisatomav.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/757e82249f8d28f809e6d0741390e07b/xobapamenenumatad.pdfIn PDF document text
    • http://roocenter.ru/upload/file/rapotalin.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/o0tpnct9envtj7td4fejqa0qvq/kapisadona.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/63442ea3b49ed07ed866b04a4ed85310/lugenejegeviku.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/ragagom.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0200e90bf---ronelexoxaredawomu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e293bd2d9f---xaxuvijesivij.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae647a5691e---75407107394.pdfIn PDF document text
    • http://zuche0551.com/upload/file/45928901152.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ac9d901dfa08c72bb5171386a6a8ad3b/zepijiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=a+contrastive+grammar+of+english+and+arabicPDF 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_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 17264 bytes
SHA-256: 1b9b5a4212662ac1ad539f425de3b6e6bb7e17f6a384651b2e92e32e3b1ed4e7
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 11112 bytes
SHA-256: a70f7868c5c849ae600904a00c4dc8c55be7a83bedc9b5e51d0d67768eae75ef

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