Malicious PDF — malware analysis report

Static analysis result for SHA-256 406228a22f0705c1…

MALICIOUS

PDF

87.6 KB Created: 2021-07-08 21:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4481bcbb930471c00edd17ac3dd680ab SHA-1: f9b2b74af15ffe0c6852be5673f3ef9670f881e3 SHA-256: 406228a22f0705c188fc64822e2f1a00d09d28701f35fdae7054e583976958da
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://taxicityplus.ru/userfiles/file/xiginukirobize.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b4695332597de46d8b3339da799ade1a/fusosodeze.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/60496330863.pdfIn PDF document text
    • https://airshow-bg.com/file/82358753368.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/82349870847.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f3abd17a6b55d8fc26d3ae12a6d6788f/17467364799.pdfIn PDF document text
    • https://tepihtrava.rs//files/jalifotopunubek.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/bc434ca4e6212895307ac2eb86d0a3ca/vexutibewezarulax.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/zaxateduluxominile.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bgm00hflo80hpnf9skb5jcoabf/84516607146.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/jh78h5jbptuk106hlmingfjlk6/44758116367.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/74273603177.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d9a9e173aed5aefe5e526c146e36f5d9/sifugobepenoxosoxafuje.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/4648048326.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f753495da---52762503432.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0rrsgc2l7gk1jdkulavb3cvd8e/12639305956.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a165dd4b72cafb9de30463976550d6e3/tulovazigivuxirusalu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb3402d9a---15621034038.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c815cf1d---radiwanilixuguzugizewog.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/tofove.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/kalajozegapufiwo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6489f3aa---2711571793.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/22719082710.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/22266999005.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/samegetumusupaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=christmas+love+quotesPDF 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_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 17256 bytes
SHA-256: 4c3a12dfdf231689709755a73a65515ce22e3631db8644f398435d29e0fa3178
font_02_sfnt_off000138e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E7 10612 bytes
SHA-256: 1f647c967774f7b518def7b3f99fad6f2a1bccb622134c321a59cd47186e80b8

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