Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dfc724c3abf179…

MALICIOUS

PDF

77.7 KB Created: 2021-08-22 02:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ffcb7cc299978b5792f7d6070273690 SHA-1: 3a33ef7295c6d87713744c36861de2697a714db0 SHA-256: 63dfc724c3abf1794cf095158a3437934b55f6d24b86822263abc98c4893278f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/uplcv?utm_term=hoja+de+trabajo+multiplicaciones PDF link annotation
    • http://waterreducer.cn/d/files/13846851973.pdfIn PDF document text
    • https://faceless.me/userfiles/files/16288492926.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/vasorubumavupona.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/scqa2ht4cqs371fp7hn1slu6r1/1330167201.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/detomugutofonaz.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/59531424108.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f8ebce9b---kiwiforewujifelubonob.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/84756292886.pdfIn PDF document text
    • http://vhshf.de/File/nalesovukefegamepej.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/85082396838.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2tru33h7agtib2mao0buaf89f7/97536875540.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b467bc977---52425810070.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c31240ad---mogidofezufam.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b314f642b8---93912668180.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/77519869108.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/pugifomomoputesivesa.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/53483cd4346fc28b6e37e8cf374afa08/gokelikixiwasipoli.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/73561348298.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca4957811---pikirifawedotapukisejikok.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/jolafetasiwofelem.pdfIn PDF document text
    • 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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 11036 bytes
SHA-256: f67ccc33b1190b466fb89785c4b0193ff30ee2e8131aeaf9a160bcfdc192e8ad
font_01_sfnt_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 17060 bytes
SHA-256: 40581f01302c3daa4af2086780ef720135a0a64c6941a338c6f593ad108f5649
font_02_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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