Malicious PDF — malware analysis report

Static analysis result for SHA-256 81538992dab491c2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 05:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0f3addc6ffa00f06493e1a2684bce03 SHA-1: 1f75ee2e584d223c4ed0b91cabda5d1937d024fa SHA-256: 81538992dab491c22febeeb813cbdfe4043c92e787cda976eac95ac070cdf094
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of these links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=watch+online+free+frozen+2 PDF link annotation
    • http://siamsnail.com/media/userfiles/files/12770307918.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/eksj2qctsm1p0gi4b60sqm4hg6/45931686998.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/xoziza.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/98072943491.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d63b47d2---dosegevononixo.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/fupebefutomep.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/90263300560.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zefutobedogoparuje.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naledinovulabititidano.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/67577884144.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/xarovubedenomuzotese.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/sebevuvigunifo.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/fesakodonatewuvulufo.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/jovomuxusasisivodine.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/timin.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/tezotinokusiwosugalu.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/zakomudewotelisad.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/51045861291.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/xamagobizar.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/77d2ceeaf04951cf7b40c795983c4a5e/99839875166.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/37775743847.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/40dbcc7c3a5fd6a5f12191705db8e185/79706465267.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/99051236190.pdfIn PDF document text
    • http://chayka-svg.ru/files/47922423403.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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 10440 bytes
SHA-256: 76658fc2060eb88a1a4b492590cc93d294447f85fd5a5004c8b5184996fe4328
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 18364 bytes
SHA-256: 8e4d18970e2a01d3a99063aaa93b1c7465ba879f761232dd154e7e719e355f06
font_02_sfnt_off00012dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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