Malicious PDF — malware analysis report

Static analysis result for SHA-256 048c8ba876886cc0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 08:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb909249bd375ba2e9643773dffc1687 SHA-1: 69d97ccd13ca2323aa766c276014fdc12dfb3e80 SHA-256: 048c8ba876886cc046a651a160f60277f8f0a811f55cbe3d4926031204a3cdde
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is part of a phishing campaign, likely using embedded JavaScript for malicious actions, hence the T1059.007 technique. The numerous embedded URLs pointing to potentially compromised or disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://self-storage.sg/images/uploadedimages/file/xivivojifofit.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6fec5443---fikulubamodazib.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/gabepoxipufiguwasidaku.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091215540264.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436d02b3945---85392254540.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/78625164167.pdfIn PDF document text
    • http://sakem.org/userfiles/files/sivemusegad.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rupanomavezovovav.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/gepedukemuranatudebexofon.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109130607252468.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/vonabari.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/xegapozemajomub.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/kumarivenugowopeferope.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/wekidopu.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/fikumevoda.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab2527ccc---sijenuxowemaluruxexeda.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/kizebulotipesutijigugu.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/85057601331.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/40678583010.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/kinaxuvu.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/mevijikup.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/kilatazaxaxigafale.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/nukonokutawas.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/95613411323.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/42713313342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+see+deleted+texts+on+androidPDF link annotation
    • 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_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 10588 bytes
SHA-256: 68504b52b00f2d7e629cfbd0831e4050d76e982c7255a4fc9738a99d719989f4
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 18296 bytes
SHA-256: c210e40cb2c3cd9a26df9211ee96703d47e060835b7ac1b522beaa9dd962102a

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