Malicious PDF — malware analysis report

Static analysis result for SHA-256 022a48def84c3a46…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 11:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25cf11bd35aae6b3e7e3daacceec3494 SHA-1: 53c4d596e40a817ce133debc8ed4b2989d4156c2 SHA-256: 022a48def84c3a469959de36a3272f755c1d3bac552ea0072980b0f4edd6167a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://queure.ru/uplcv?utm_term=startseite+bei+chrome+android+festlegen PDF link annotation
    • http://imobiliariaimperio.com/files/files/2390538936.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/93934567793.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a2b9bc4a50---67637627326.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/rimavozamit.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/69605795290.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/pidavesebivigedevevat.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/59341978044.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/94217155209.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/faziziwamibemotimizo.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sovotokajevazegogitominal.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/rukasajewekux.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/54194283290.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/tigutosepukefutaxili.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/59044374209.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/6323663135.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/37594568181.pdfIn PDF document text
    • http://espokebar.com/uploads/files/norobiturilem.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/33763681684.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/tudususuxog.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/degogakexatil.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/84a46d1e638edd981180ae1392687a56/jiladu.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/fijenu.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/73882579700.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/bdf503380ff3434338e8cb5ecf09da52/56260831589.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c484ff03---24832677113.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/53644660086.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/1288388719.pdfIn PDF document text
    • https://e-midas.ro/files/file/tekizi.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 11136 bytes
SHA-256: 6af2b70621adc8a3233eebad65680c0dd2b686a4651168edf1c58818e3ee8088
font_02_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 20136 bytes
SHA-256: 2eb3dc3319a27d162fa71d9b99b971fd89fcc08dfd49f53d47177953f3ceb461