Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f1caee88c1500c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 01:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f5a0727eda66ec2814bc129e577ba309 SHA-1: 1ca369b441317f116423f6354b8f1f3639af4e55 SHA-256: d3f1caee88c1500c1d1d7bfffb2da150761feb8bb05c39e3889c850c94a64a64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://livestocktool.com/d/files/30494740687.pdf In PDF document text
    • http://estatepie.com/files/userfiles/file/fusimogalazibezesi.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/4188746384.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/80693120429.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/onh48m611v0ksasbdltjq7ut26/87554497441.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076e936d4097---77157551651.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608187e7d3fa3---devabotijaj.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a5c4dd22c33f835f997d88f1b19ace02/wuxuvanofefegurewe.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/59956989093.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915573c58d0---tanipavemufesa.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed59d6d13b---wifojuzapoxudeg.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35e137f45a29f039831f79999ee93015/wipuwaperixinerom.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/31590699220.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/83503453854.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/durawifevuj.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/towubodimil.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/sosatowutusufokiwobawa.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9a76af112---94740558729.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/2s3t6tnto5ffepilgcjmc3g7v4/97401314051.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e78f93ead1a8ef89a32a2ac6c4b5cb54/50742668090.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2b021b48---murabugasasam.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/gotaxozazi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b312e187b5---lisimopajo.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/29607773579.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f7858491d---23058187410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=comprehensive+primary+health+care+pdfPDF link annotation
    • 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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 11096 bytes
SHA-256: bbaddfda6cec18f5f5d33a3bd0a2564ca1f9497488838feaf2c2824288b78304
font_02_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 17340 bytes
SHA-256: d8f3b68737cbed366435d67975e948ac2a2da6afc1c73a131e81b71d24471940