Malicious PDF — malware analysis report

Static analysis result for SHA-256 290759c81ef49fce…

MALICIOUS

PDF

90.4 KB Created: 2021-07-20 21:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 21f2aa97882556b4ac1f0983c2ffb80a SHA-1: 0aab2eabe83423fd204bde21c37ec0e8d3fa1a48 SHA-256: 290759c81ef49fce3ef4ea2f7181e2e70a51d66fe847aea0d3aa6b6032564321
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d5c62c95e6c8005fe3795e0bc61f7b0c/giluputopazubikufozere.pdf In PDF document text
    • http://chinhsuasolieu.com/media/files/bugasukotonupu.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/libidisirefas.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/bizomaxures.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1567db1b4---temufinivifunap.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607272f38fc34---gokitifobanezojuwegaxep.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/eee073b98906891b5695b74d4c3dbf0b/bogafovewepefomelurek.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6129cdf4---18357303413.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09ce82d4c---94703148486.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/pitulefu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b0c748e4fa0ee1c38f29b88e2e040874/lawutivunarufudex.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/biwazawomila.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/31705999747.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/53498568257.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/68717051948.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/56493174688.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099e7fdbe6d6---45156079925.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jmuj9mb7mbkodj6g8g0ib4ngc5/36253410646.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e89ouiu9cbud6c7egf3gfk2p90/guwemod.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/45546783987.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb337198ff---piweduvobawusegewu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/258i4hpti0fsprj888orodtl73/xilewevaba.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/5388033882.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/65924239917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=family+campground+on+current+riverPDF 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_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 17136 bytes
SHA-256: 132be86691be353c5b9b85767f85d03f8e0f7289b0eb55930b838f65abf5adc5
font_01_sfnt_off00012b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 10944 bytes
SHA-256: 76755b23fb4f3a179658c8587b073a2f4688475e1adc01ed076473be056af75d
font_02_sfnt_off0001443a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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