Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bffe68ae3412096…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 08:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73bce7f614a7a4c4f6ceafd5f1a3c801 SHA-1: bf9e341a31e44f9dda84d21d59370934f4d3543b SHA-256: 9bffe68ae341209685ae65b25e130119062d1540fc0b98b481a3cafe7110b611
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted point to potentially compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the presence of numerous links to external PDFs supports the link farm classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://ipsaix.com/ckeditor/ckfinder/userfiles/files/96877204178.pdf In PDF document text
    • http://joltiy.ru/uploads/files/39112377870.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/46216533234.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/jegavalunif.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/41671819830.pdfIn PDF document text
    • https://izr.fr/files/wexereberamux.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/49d8de8572d5ae45a5545c1ea79c6d18/25988390902.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/nenifaw.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/47632980519.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/40538272729.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/kuvekikerufosowuzagoge.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/wojebitotulepezufuboteb.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/69205015470.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210901075227.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/gozoravigalumime.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/88224653624.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f05b1fd83---13359919485.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/jofopevijaxu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f3b56b23bb587a6e6b7e6c69ade12f98/11452846389.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/66718299731.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161376b421a53c---vuzabijojebugajanomene.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/422217934a89d6910d6928c44489def1/13425370178.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/81315759575.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tudora.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946cc12105---mogonogutosov.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cd5ae50b---desumafaxodebulej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=snaptube+free+music+and+video+downloaderPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 17424 bytes
SHA-256: fe7840f448bacd72b7fbcc54841dac1f43c32eec30c7ca3b363e097a0154eaeb
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 11248 bytes
SHA-256: 8d785278335eb3056433dca4528fd170915d6d887c0d478e2fa845472cfd04a9
font_02_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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