Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19cd0c71c212e77…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 01:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83d3f6e30e988c919768973b4604765b SHA-1: f19163acf09093d616fd031bd8f347a30568e70f SHA-256: b19cd0c71c212e77c3404b14c804eaac2c801082e38263566d8b5b75464369d1
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of multiple distinct hosts and the use of UTM parameters further support the interpretation of this document as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://studiomuraca.eu/userfiles/files/zetesajuvorajebufisud.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/64259145242.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af404e215---dokig.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/91972689912.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66b48a0cc---68286626686.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160798bd45f32f---11066158769.pdf
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/kejodavi.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec22b07d0140b64ec62cbea798edcd17/rilomogetibiruwejepal.pdf
    • https://drnanemilk.com/tctt/sites/aaa/file/43028379164.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ded2f52df7---jefenexunuxojoselogowo.pdf
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/voziwiwazikivugasijibapar.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8cc051ec0238ada37f17ce62c67751d9/91600509279.pdf
    • http://skisun.it/userfiles/files/keninapavofiwol.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/79984689972.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/benewikapo.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5uvd0qq8b9ago60s8b8185d4n4/95339349281.pdf
    • http://botosani.ro/img/uploads/file/17142579119.pdf
    • http://101-games.ru/images/uploads/files/33657194258.pdf
    • http://lawrence-spruill.com/clients/42275/File/nomodizozilikikeropifunuz.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074709f15ac9---29022086242.pdf
    • http://mayamalay.com/clients/874202/File/60689684772.pdf
    • http://satbietthu.com/luutru/files/dotedegabavaxarimuw.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076521bc6dae---pawajevedititufujijis.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0972df86f191118bc41f8e45229c86ef/nigaduboragagemunadozov.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0ce96a779c2195e979e91b07994eb2ee/revuzofive.pdf
    • https://lescourailleurs.com/upload/editor/file/birigewijira.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=havisham+carol+ann+duffy+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c0.bin
69cc712f253e5c1fd71e9477299155fb3cf80c5ce22226db0c8c9390ec8d5e73
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 16600 bytes
font_01_sfnt_off00010b74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 16792 bytes
font_02_sfnt_off0001238b.bin
5ad8b11e19e6454a1666aeefa37ad9ffba503bc802be23732f7467bd3b217641
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 10924 bytes