Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a1531f2bcb1c9a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 18:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5753f68eae981854ee52ee15959df0fb SHA-1: 3d02fc3c129b76254476f82c3c4c3916721020a1 SHA-256: 52a1531f2bcb1c9a956609e9c5246db1e1820764fe1925f6b2a238ace41af628
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or scam attempt, indicated by the 'SE_CALLBACK_LURE' heuristic and numerous embedded URLs pointing to compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a social engineering attack designed to trick the user into interacting with malicious links or making a fraudulent call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=where+do+i+find+hidden+apps+on+my+phone PDF link annotation
    • http://benetalent.com/upload/files/81623187050.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce9134a0aa1295a09acb03a5df642dc9/lusifopafoxetuduxa.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/tetadexonafa.pdfIn PDF document text
    • http://precisao.org/files/files/85987034601.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/faduzigobipe.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/53615c05f22dec3cf98e7e72ca104acc/89781500247.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/derubugimisekega.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/62196993051.pdfIn PDF document text
    • http://0953057778.kad.tw/kads/ckfinder/userfiles/files/xuwakujoxumovin.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/girurosirivubudavagu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l926jnhffd7plnnaoga34e3sk7/58231274394.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/pibomepabefafogokera.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210916_6C2C98EDA7104113.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/50117911327.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1159b486b967276cede0b0f38dd81a32/81225108939.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d4e3d0c4---xifej.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/tozelenemuzob.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/kunusotededuwatozidelu.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/98446710114.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/jamekinomalarimuneg.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/58088110860.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210920043737.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_off0000ad34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD34 10728 bytes
SHA-256: 00f234936f1e7c89c5ac2e8e76b1efd556cd35b592fb4f41a63b22ca5435b4bd
font_01_sfnt_off0000c5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A4 15740 bytes
SHA-256: 1f99c1b8532e634b87723ee8ac77761b24287f6c5f72443f188ccffabf657269
font_02_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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