Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3de691fcb883c18…

MALICIOUS

PDF

90.9 KB Created: 2021-06-29 09:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e74b2a98607ab987fd9c7e54fdc4f19 SHA-1: 0541eb41ddbdb53b5360d7413e8f9d6ef3bfa822 SHA-256: a3de691fcb883c18ddfce719a5fa6550f1c160d8514393f78a3a07c01327f117
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad614958c---wojuzel.pdf
    • http://hungbuloon.com/media/ftp/file/xoruvefeveroduvenaxon.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bf02abe7ea9f90aee7b4c31dae4d5a4/59054327823.pdf
    • http://jarosi.hu/files/file/30084131715.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/pcs1o02k8opa9aivn56lir8f19/lujetozata.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/scis1144p8uj7vaesbtqfqs2a2/53444419465.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4b1d21882d62e75e246f3ca0e86ceaf5/29684736094.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ae7677d80---48411196267.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607819d27128a---nijinusorezawul.pdf
    • http://prime-standard.com/piceditor/file/ramiwamupesijerofibozosa.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/646f922fdf4951b9462a0e1c52cc7882/92169963936.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5c5b2efe6---kifidopajerirituwifobefej.pdf
    • https://fallsplat.se/file/zisiba.pdf
    • https://linhquan-group.com/upload/ck/files/wimegimugavesulupus.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/972f07bc526b3c03862686bbdeb1f681/kadigogojujidirokitis.pdf
    • https://condominiovillage.com/userfiles/file/92525803734.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160991d71dfcc2---88176980598.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9916727fb---7208204921.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ce074a7a---relir.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffadbe7d76---83968764714.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc658d5f6a---63503935206.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/1kpkqttdbpe6uqfetosn2mccf6/kifobekun.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/waduvarawimeritufatoboru.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160840f369cfb4---xuvemirefomulelupofarela.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/18a7d631948a2355804cb03400bef5b2/30138405804.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252b192d72---durixajajevovu.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf4c13a21---dadimozesenagaz.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0653f10da---wudibom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+catch+willowbrook
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7a.bin
9cb81fa17c880c74709f59916612b0c9c547f290444b9c3f5d399e8e13578cfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 10336 bytes
font_01_sfnt_off0000f1fc.bin
5d9315201343b5fd82b632410709e5e099507275ce45f37905c608c3adf8eed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 17680 bytes
font_02_sfnt_off00011fd6.bin
1055cb7e31e14aefb1489d496b6827e30556b87c764d0037b530e44aea25f272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 2644 bytes
font_03_sfnt_off00012ae1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 16792 bytes
font_04_sfnt_off000142f2.bin
691e517c213823b3b70cdb1a2a958c7968597e27cd7000701d0e828367d699f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142F2 16944 bytes

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