Malicious PDF — malware analysis report

Static analysis result for SHA-256 31353d1168f100d8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-22 10:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2258a4016cbee0ef943c133b53b9cf2a SHA-1: fd5205ddd127d54182546c195a1d7ae7ad3a5054 SHA-256: 31353d1168f100d864ae0eb2ce55be138f30bc6e947c63e610bcddf76886919c
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic confirms the document's purpose is to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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://svingenieria.cl/userfiles/file/26417915272.pdf In PDF document text
    • http://indel.sk/userfiles/file/tubemosonupogiduwadadug.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/26994489257.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/zodomapisikixakokijofupez.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/lazid.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/28322494384.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/15656723583.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/13496078753.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/ninejeva.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b1452337---koviforu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161365e4e75b95---97462765527.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/71722967256.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/xupidijujoxosaxan.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/masuvirenuxadegexigab.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/48697e45091c1f92c8c2605f2ed07f6d/32330971994.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437a5de63a---xovimofixad.pdfIn PDF document text
    • http://aven.su/userfiles/file/75404327643.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614000502c532---62014252090.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/45563508372.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/fujazanewonifojolujoru.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/38955059701.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/49734409082.pdfIn PDF document text
    • http://ccsl.asia/files/risosadobuzap.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a0b7ed6da---refojugas.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/43190129894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kiwi+browser+apkPDF 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_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 10304 bytes
SHA-256: 27ef3cdc8b313e138a8a6a9cbdbaa611047dc35c06fd9d97a64c74ccb1283426
font_01_sfnt_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 16840 bytes
SHA-256: 2a23b7ecf4ba24bec662626cb9aaee0ab60e4f1aa4a183e4b92a8276d291d543

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