Malicious PDF — malware analysis report

Static analysis result for SHA-256 18842b4a824ea2d2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 13:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcea042ff3cec6890b757143b4772217 SHA-1: b77db2fc179cec9e37e7135a0f477474bf830802 SHA-256: 18842b4a824ea2d26c9902c19f2d279d1c0a23443e9f22422337bfeac8ebae47
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting multiple heuristic firings related to PDF link farms and compromised CMS uploads. The embedded URLs, such as http://studiomedicoveterinariobellucci.eu/userfiles/files/gaxudenabazisegexemadezul.pdf and https://queure.ru/uplcv?utm_term=free+robux+hack+2021+no+human+verification, suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=free+robux+hack+2021+no+human+verification PDF link annotation
    • http://saharun.org/uploads/ckfinder/userfiles/files/jisekazesexebozo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e1337c16---88030451092.pdfIn PDF document text
    • http://aprt1day.ru/file/vajulitomamor.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5dae22eb---26760330571.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/gaxudenabazisegexemadezul.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/97602221058.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/75352971482.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/96303057684.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144578d210a4---82165946576.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614286e3da6f5---19943380304.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/sisili.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/dirijuvusekar.pdfIn PDF document text
    • https://europartner2.pl/uploads/suruvax.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/20263793498.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090809253972.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/vofonuva.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/tavexobe.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/15324218119.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ecdf3bdedd416271ff4e14a718d5a0f7/boxotasulogaroxudolenoje.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/besesobedemametasofi.pdfIn PDF document text
    • https://123natura.com/stockages/files/4899451092.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614334efc2875---55628945809.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/nozatejiburepom.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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 17888 bytes
SHA-256: bd980edda6cf792f72555733c86884a64d7b2fe3ddeac531d9b04942db1add1c
font_02_sfnt_off000124e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 11160 bytes
SHA-256: 19d2c63f2bb2860cc9ecaaf920376d8bc2805ab74ba6bd93343fbf8465d1f683

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