Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdbf7bec112bf13…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 10:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22aa955f6383a1e0036380ce534e8ddf SHA-1: 39f10f12889ee5cd3d38836699fefa84d60ff179 SHA-256: afdbf7bec112bf134d5e3acedbdf5118ad674f2a7f7c5212952703f206c96d7c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures for phishing or to download further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nomylo.ru/uplcv?utm_term=generate+pdf+from+vb+net
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073054dc7608---poxina.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf57609111---jamawexufuxa.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jpu2dj7mqnfkvrruf2shh8lnr3/purerodeboxinegage.pdf
    • https://atcotourismtravel.com/userfiles/file/38415296997.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf08228cd13---rofibamix.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a452928eca---23805063575.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/34ljmd9a7vne1neppn2927ofd5/luduwuzulalilidimex.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ttk1ddf0e5qlf0s3tgn24494ps/37779733459.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760b3cb1730---77805754124.pdf
    • http://passaicvalleyclassof1957.com/clients/44362/File/juperadokiwezomaxizixiw.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ca78d5a21e351a9bd06bd045f10697e0/nejug.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/872d49b7e426f87812f92374a989ec82/fofij.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d993912a---46927384731.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/p18n5cf4krh0srmh8c6901op65/xaxugedafijimaxub.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbccf7919fa---bopekopa.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/csqlm716i0l1l3ip5j3e2k0dr2/paxogugawaberes.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/e8f746cc3ce1e49a375538935d17150a/dalubalafaf.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdefa1f2838---30530494176.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609623151af10---suzenimibo.pdf
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/zixaj.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424faeb286---samavosufobibi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 16792 bytes
font_01_sfnt_off00010352.bin
be29978b451003fff162a048e60980153aeef3056455ae404fca80ead3c0317b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 17712 bytes
font_02_sfnt_off0001322f.bin
bbee70e193389594801a4dc4055ef004ad1ee9ca9d87cf6f4d5c37de07d3cf27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1322F 10596 bytes

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