Malicious PDF — malware analysis report

Static analysis result for SHA-256 2641450f3d798c78…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 18:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 849c97a27129f36f510c603f52924e19 SHA-1: 5879e8782a325a5cb452f0d43400bf9aa8f4fd2e SHA-256: 2641450f3d798c78b62fb49088d3132184b1987696316a52d6f956ccd057fd89
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. The presence of external URIs and link farms points towards a tactic of directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://crysiq.ru/uplcv?utm_term=dora+and+the+lost+city+of+gold+full+movie+tamil+dubbed PDF link annotation
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/8719111738.pdfIn PDF document text
    • http://atek-ent.com/upload/file/ninupepegapepifuwikano.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a685e8eabd1---zokizigolide.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/51852318032.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/kowabulekaxapuwawiwara.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sugajijizulawavet.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884fc419355---vewivolimadomeninuta.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706b5d44cfb---gisojitavezigurunalesobe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b58e9a8c045---boveminetuvivere.pdfIn PDF document text
    • http://coffee33.ru/archive/file/80359680779.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce212135b5---vegowe.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160825c668afe0---juxideguxisi.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/86626482973.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/u399u0sn5l1il9r9tg084m9dp2/46900168103.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/64371930547.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607762b27138e---wiguditexapugoseg.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/70271074501.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d453a0f84f---vapuzofipiteganefakupogez.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/59eb04c925a7e7fb33d68710485992f1/fusokubogi.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/45841282891.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/85605449622.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/75692660631.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/65207231336.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/79504738702.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef773f0322---misokevororezivol.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/8be3e5d15cb4b91b78f4dc8355cfcf6d/zuzowogexo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/tuvusazovujonaliv.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_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 11344 bytes
SHA-256: e67200912a9be996715df2353f875d1bbd3b29f3ab02ab723cf58ad665b0ec25
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 18360 bytes
SHA-256: 5a31e0b456c98a92c26d48e1e2e9d2d60bd43d650bae221929104d72655d3dd7
font_02_sfnt_off00013d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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