Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1569d217e5c3f52…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 08:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c133838f5181bafd288adcf7d38c9c9b SHA-1: 8dacf7be49fc5d8823c695e0a15ed65890cccb63 SHA-256: e1569d217e5c3f5208acf95ff5158e38f145ad1cbcbc1bc5120c118d0dbd4c10
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external URIs and embedded links that point to compromised WordPress sites and disposable domains, suggesting it functions as a link farm. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://irlanc.ru/uplcv?utm_term=permutation+and+combination+pdf+for+bank+po PDF link annotation
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2e2afb8e5b9d4f50028a2c2402190d86/dolowitapowakizukokogika.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/72306395506.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e1024925---posikatamufavuluroz.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/rododavulanexolelonoj.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c0b96477c---jelojevasekala.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/96777606201.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaed592afd---redileropitofokikame.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16109585f21c81---simabuxifarijesuvukakiper.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ae388eb6133dd29209d53b5272f7ab26/kigerapilavakurulajow.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/67392167419.pdfIn PDF document text
    • https://dragulf.no/files/file/gomawiwoketajexazap.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/ximaxuzunujejixenuruv.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e5af0ca6---18761432482.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/91270495257.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/4267882306.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/fozox.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/21fc0a00960c6b5822e93199922a00d4/mewaroxikuzozud.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/953abc483f0b5f599f84bd399548a224/93720786167.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050822312048.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14231f54b---sikimawifafodujoranijenul.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/libejuxogoxixupe.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bupebu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/41393401522.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/vugagajefemujazof.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_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 21052 bytes
SHA-256: 02c4f8fc520c482f6f3889b82dfe75c0d47ce3db9bffb2c0a923b0a7b1ac3cb1
font_01_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 10900 bytes
SHA-256: 755fea70efab7a3e788f22508dbabee711262f797af93f772667e30c35392707
font_02_sfnt_off00012c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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