Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a5468f44c10f3e…

MALICIOUS

PDF

93.8 KB Created: 2021-07-19 16:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88c1f8adc99497152d86290c5cd66113 SHA-1: 8cddc97aede54d89b135767c0da59cb022f0ebbb SHA-256: a3a5468f44c10f3ee184527f0992853cdc38b9eb90bf1edc1d741d5446b04eaa
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, directing users to potentially malicious content. Several heuristics indicate these links point to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849da789f43---kerokofusujuf.pdf PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fee9f2c19---wafisigoludatiku.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/64351510060.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/25697170965.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/96700772966.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/44022659356.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f22f10910---fitomobojudujuj.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0daaf4f979---56794096555.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fuvemesozowaguwa.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/62804519211.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/delulidobuvatuju.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f428005795---65225054800.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b21b13697f---setefazawaxike.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/puzereto.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/33249407217.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/kovupawobibojodevelikebu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ikhj3jq7bbabrkbe680r39q5i7/62517207161.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826618db3e9---19872382794.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/52d76713bd5c485a8365d62d4c8869dc/79346139809.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gt2j2veh23bsjkon1m79lm2pc4/xuretugamiverovin.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/kikekiseludugobesepud.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a2ccb1eb37483f17d6e4a41dbda58e57/luduvikedukun.pdfIn PDF document text
    • http://geoman.cz/data/file/zebebavani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=strength+to+love+martin+luther+king+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/dikudedirafulamo.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_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 16620 bytes
SHA-256: eedd7723d069f69c58ce39452f258991982be25bedbe0e5bc5150c8bffb2a34e
font_01_sfnt_off00013834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13834 11112 bytes
SHA-256: d7d957f3d728eb9ca34a1f1e61148e24a26db7759001ce397220c83f5d5e2190
font_02_sfnt_off000151bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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