Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7433cb4f23be9f5…

MALICIOUS

PDF

99.1 KB Created: 2021-09-05 18:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 856e5112cdfc92ebd26968f41c557243 SHA-1: 5a23f6cec97d030c8a6b08920726f32b11803a35 SHA-256: e7433cb4f23be9f5fe587c9860ae7c858a62d127449ccb54fbb24575bcac4fba
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aquatim.ro/uploads/files/60619596103.pdf In PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/51657054141.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7e3296b7---kiveji.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/60550806466.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gisadafalorutolugowelib.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/92008857334.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f840f9e2ff231e2840d3a35dfded9436/60210748548.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94a5dc80a---xukiwijesafatinibe.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa50d5ea8---86227146002.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/sofozivoxoxajevemo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b6b253f5ea1d28609768c8a99c035dee/wogavedovomutarexuwaduk.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/98428279246.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/87628206400.pdfIn PDF document text
    • http://skisun.it/userfiles/files/dulumelatovujonabuvagixok.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/buwusawikepogupevesapusiw.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da8c032527285b5e76c3ab66c4f7b874/43849937177.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69b9c74ec---44549046297.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c42310169d8580f7b7f2f064e2d392d6/80868465313.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/77040165174.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8d2b7f1a090b6552193274dbbb6d65ad/tanajugi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898550a445e---nelibawokufusejifigito.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/fd63a638762a9ec0485cdb3215572657/24615499951.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/63501254960.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/24549911272.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/42539806449.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c987438e376---natet.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/tirapagirofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tp+link+vr600v+manualPDF 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_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 19972 bytes
SHA-256: e9221f5f7ec2db41f27f14986a402ac6e6dc9ed9861164d95210dad072322abd
font_01_sfnt_off00014d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8B 10404 bytes
SHA-256: 7f0f3bed96658064193119a0f426cba75d8b8a857fd0dd5739cad56e984994af
font_02_sfnt_off00016507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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