Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e2a2cf408441fe…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 13:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79955a6f664ebfb43423624e44d29c89 SHA-1: 8964be8b6d7da25c5749ba961e181ef6859ac848 SHA-256: 19e2a2cf408441fe43dc41cfd52a69202e34d244f899e71459d72ec4fd95ba0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs lead to compromised WordPress sites or disposable hosting, indicating a likely attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://zuche0551.com/upload/file/janegevaji.pdf In PDF document text
    • http://kvarkeno56.ru/userfiles/file/wekidixavirip.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c45adc385a---volutukumuvibigizitomono.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///puvibuduleja.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/pusasukowarejinusanezelif.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143b64b2911c---nufefuwisuzofutogopikepo.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/nefugewimuvapitudipegopo.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/65183909688.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/54433584240.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/rimuvufati.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/35706255544.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/xogesusitedawujojunikixa.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05fb77e23---53931093244.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/35819951673.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/23693324364.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/gikexidivimux.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/magaduzelelarujowaruzaxu.pdfIn PDF document text
    • http://viorina-deko.com/images/file/25620393717.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/80009888827.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7459d237b86700bea8bdc0165da6eb99/19039271427.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/75201940858.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/30307713117.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/jafenunaf.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/dd3c141e24e6645b36c91fe0b39a10ab/90596384778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+see+block+numbers+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_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 10940 bytes
SHA-256: ec24dfc1ff383a7c58b221b51bd0dc06a5fbb625257b95ca1fe40d8446a61854
font_01_sfnt_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 15620 bytes
SHA-256: 569706e0f47b65c0b040ca53b16c897291743f028a783140191367ea27cfa9bc