Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11fc2f7733e2224…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 01:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03cea2c7e1cab6e60281c68985d4cc38 SHA-1: faa53c1774eb2e3a2cdb72a6c207cf5ed01108be SHA-256: a11fc2f7733e2224556becceca5db84a9214e486d301f9b59404c005575408c7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, including compromised WordPress uploads and disposable hosting sites. The presence of numerous links and the use of UTM parameters suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=modded+apk+sims+mobile PDF link annotation
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/nopizo.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/7848a27122c3a00894e754ec6866d8d4/92678886308.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/99512175778.pdfIn PDF document text
    • https://fasaac.org/temp/files/wudafijubixewa.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/57828379921.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/darewomuxozagaki.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/38858390519.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1851ed0ec23daebef3f200a0fc58405a/70654299801.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c2d72eaf7ac4c570e881d846e28e2bac/51378576905.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/xodulerovidusi.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/74297011583.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/jozokuwigirupamudedotape.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/bazosefafunimiza.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/83608438240.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-12/20210912055028302419.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/janulixopozasaritigenadu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206e62596---lukorurururaselidutat.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/87106506488.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/figunofixedafan.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/bugoxexujaj.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/4639581166.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161305a2c0559c---begoxoposisu.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/kivowarawifux.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_off0000c180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC180 17472 bytes
SHA-256: 172838408c8355cb2b896b399026d14720969d4cc2809545851839793bf4d80a
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 10476 bytes
SHA-256: 465088728cdb0d680decc0647042556337502bcaba876c1a01eec62bccb4a67c
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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