Malicious PDF — malware analysis report

Static analysis result for SHA-256 91345e9cd9e522bc…

MALICIOUS

PDF

96.4 KB Created: 2021-08-25 07:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4620015ff506e5cf0b058a1fc9c51520 SHA-1: c5a05386ef7c2e80794bd3f995b280f5d1b51b96 SHA-256: 91345e9cd9e522bc4b5eea3bd593773f373176fcd298aa7b61f6f730ec0b0c10
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a phishing campaign, likely attempting to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=shortest+country+in+the+world PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e499e156fce---28992469570.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/29615060202.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/wutozuvuxebaxinifiram.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///vevaninomiganaxazi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723da4b87cf---23619517000.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/63788416216.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/koraxadopejuj.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/40442934111.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/58960877248.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/29983230365.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/dekananifeba.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b626f167875---96067490357.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/6995502521.pdfIn PDF document text
    • http://huefpdf.org/upload/file/98772640335.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/wodibilizevepibe.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/512ded47020d50d3a57f155559b9cdd3/nukajivulepenudek.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/raditafizutizofax.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kuwinomasamul.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/lunasi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e63d0633ea---jaxanafo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd8e26702---74763580903.pdfIn PDF document text
    • https://capecoralliving.com/media/file/botuditadezirujimejodatu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/55402083442.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_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 10680 bytes
SHA-256: 63a38bd34cdb514e794199f56e4e96ed970d3285740cfbb3573693267036f538
font_01_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 17448 bytes
SHA-256: 964d6a941e230a9e4685cb1cb798b09ce4f1e72d4c1cb18f98054ddd6e608018
font_02_sfnt_off00015ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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