Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1119e87ecc75e8…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 23:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2160842cae8281f1e1c746f86edc129 SHA-1: 2e2848d9ce4617915c01bf8c3589c2055034f187 SHA-256: be1119e87ecc75e8a46cdf0617b8e2f19fab60b25c8bffbc43ebf857a628a0c9
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document exhibits social engineering tactics, specifically a 'Browser extension / update installation lure' (SE_BROWSER_INSTALL_LURE) and instructions to run commands (SE_CLICKFIX). This suggests the document aims to deceive the user into installing malicious software or revealing credentials. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports a phishing or malware distribution scheme. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=dark+mode+on+chrome+browser PDF link annotation
    • https://sapporopools.com/contents/files/84317761022.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/37305224973.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/duzax.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/77130556223.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161414627e2a4b---wuniba.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/49632974320.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ed288cbf1068c3a648ee65082513e3e3/gebobatupokunekajem.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/meboj.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/ziduzaxolegibifedigigen.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/sijisebusulobidafi.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/zexagozan.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/76089113126.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61911071291.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/viteso.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161302784d1381---xanusadatolufewesogim.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/70437fb01f68456c243d08b58d48ad8d/76118125508.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/bumorubetezexo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/c114fbe8a541onjbtjdbp6i4vq/jegisene.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/jolafawojeru.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/64280940489.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/65251767808.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210910_532D9DEBFDCDD419.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/lekekelolesetabadofusi.pdfIn PDF document text
    • https://tebra.si/userfiles/file/kasonejuvixotosozetaxo.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/89844505849.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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 18348 bytes
SHA-256: 591bac54a2575eab0b0fe4963afd49c15de38fe1833b968f97d56a983b9339ee
font_01_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 10720 bytes
SHA-256: ee56361f39b9f1b4be93b05e8f2b1d578737cffaab19769bd8eeb140ef8b9ec4

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