Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3d619a2234015d…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 03:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d3549a1927339d4284b88964dbfd413 SHA-1: 9fe760220a9b17cc2f0675cffdea772f971b2093 SHA-256: fa3d619a2234015d1cb80958f5b8fcf4550d3b3a0fe974a7bbbdf9b415d9dc55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=free+printable+worksheets+on+commas+in+a+series PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607206ad751e1---62882793601.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e4c247edd2ffa3809622880db98e1d98/71323664059.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/zuxerodemafasupejux.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/6qvshjgobidupt5vgel3gpcp87/28946049303.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28798d36f---savewenurovediduvagax.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/38558752711.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622671763.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/m3s3jiulmj6a4acfeu7vg2lul6/77766882183.pdfIn PDF document text
    • https://arendic.cl/files/95743027436.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23be5b05d---nodirapajerabimutenogeg.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/firutikegupikuvob.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/29773005229.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/81099328896.pdfIn PDF document text
    • http://donghotam.com/luutru/files/wonowofebadaw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd27851cf---24320834440.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/wekud.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/52789164841.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/47714536426.pdfIn PDF document text
    • https://preciseenergygroup.com/media/kivosagalopa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59d7338beb---49148974150.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-3/20210803134056455030.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160756ad5e2998---57636845816.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/rujebi.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_off0000b74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 10932 bytes
SHA-256: 9980d1daf72fc56721b8097a76d8cc14a76891f96e39ed658d6522a34f2db572
font_02_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 15036 bytes
SHA-256: 0342209f84241226d0002324208dd997be6e3158f057ba10f3c4de74d2b447b7

Open this report in the interactive analyzer, or submit your own file for analysis.