Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62bec5ce2b39dc6…

MALICIOUS

PDF

125.6 KB Created: 2021-09-07 03:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 161aa624ae52209f177f0db48a8e8772 SHA-1: 2a69f06310c4577b11eff33a45461afff50fc0d2 SHA-256: c62bec5ce2b39dc6a3a6951e77be6a67fc3b837c9659994beca37863852aec5c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and link farms points towards an effort to redirect users to malicious content, likely as a first stage of a larger attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=aprendizajes+clave+para+la+educacion+integral+2017+pdf+primer+grado PDF link annotation
    • https://inifd.london/uploads/file/zudidivimupefewolaw.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/kunalajoxifav.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210707041923.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/wasipipamebofufinokotus.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ef02b0126---vubawoxowunexurow.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/kalunabeti.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/op5g06eim8fddm601duti51c80/79702674552.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/73510401957.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/37032270956.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ed5890a98e974a53e5c0d952d8d7480d/71823870556.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/14954139864.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/25973395992.pdfIn PDF document text
    • https://mauspro.net/upload/files/jijow.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/5930604846.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/2319821381.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/59209941906.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/02b7a99bed5b0481e26c9dddb1c7eae7/nutozaxowabakulatenas.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4e46090f---21979073269.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/o0ms3ftch2fr8cemblp14rafgb/dozuramapofamalefizog.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/nakojek.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5587aa9d95---mejibizisofusomuzupodaw.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/mabamatedise.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_off000176fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176FA 23708 bytes
SHA-256: 86698c811b85dbc3b0cb3a2c22d77f1afe4cf068241ff5eb28e9f51fea4f5f0c
font_01_sfnt_off0001b287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B287 11644 bytes
SHA-256: 79a49f4f868318448ddb9a287b1129b5f01e61ba28fc1bf6ab6f3fa3871bda7c
font_02_sfnt_off0001ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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