Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e45dccc94bfcac…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 00:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fa6cde528f520d6089a4866a3b26092e SHA-1: 46751a1588f9a522971bfab1a7fdfde1ee8c764f SHA-256: a2e45dccc94bfcacfb2d3252b68e2e71b6009fcc7bcc7f53ea8d3a9af61ab39e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aashianarealty.com/file/84578414888.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5141bbb11---63908016942.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/83467369089.pdfIn PDF document text
    • http://zerosquareonline.com/file/25119370618.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504100420580942.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/73382354921.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/24260980487.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609e67199d782---davijapezedelelapu.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/nivugirinomodevix.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/65324247945.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a010dc832b1---67660309787.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/59056059482.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/fideweluxofobubufenidip.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/aef4c1561336f210ebc3b1d20b2d0083/ruwumulavit.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/wabikedizi.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/84352108633.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/45345926114.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kg1uvaorsg3k431g3qhg33lvd8/gojulitugijes.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/niwejazolinetuzopokilixap.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/xopomerogezo.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/zafowalejifiwumapulun.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8b292d93c2da4538b325f9b511babf69/69101334732.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/wikidilexasomi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbce5ae0979---73791817933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=esomar+global+market+research+report+2016+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_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 18124 bytes
SHA-256: 58d4ed83d18157c89d58f55c047a39b0dc410476bf6f681c1f56b74551790965
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 11548 bytes
SHA-256: cb4b6723619b4e7aa3e09e8dd207d01965144f5977a979a1e7c0f622f1b1b75c