Malicious PDF — malware analysis report

Static analysis result for SHA-256 e089da271d2c4923…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 04:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4cc7d603d667c085e307a7b4e1f9348 SHA-1: 830248ac33e23ac148028b0cd2833ee913df575a SHA-256: e089da271d2c4923dfefa714387b338f0c4ed618f83a57776065fe6b059f510d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malware or phish for credentials.

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 http://exito-opakowania.pl/userfiles/file/54321351888.pdf In PDF document text
    • https://die-elke.de/cms/elke_page_files/file/60296280917.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/31256795753.pdfIn PDF document text
    • https://majubesar.org/contents/files/ganoropugidifapabuxakubo.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/77802911366.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5365d4504---59674065580.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090815031170554.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/30198456420.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f734d0d33f---japijigidanajetusolemu.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/gogodakimapurimixazi.pdfIn PDF document text
    • http://prompol.com/media/file/74758634791.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/zosamivivideninu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80708404a---20565479916.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/69204808367.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1a4298f6311e6d43ef396fba4f5abe05/kafufunevudin.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/90265725142.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16137611bc10a2---5356483389.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/togaxiwapisufezizasaz.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d483eee65ace59ec6f94cbfa9da3c69c/lomuwolu.pdfIn PDF document text
    • https://zzhqhi.com/d/files/vurudesezizegiwurugogog.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/28940847998.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/kexedamogujiwasakove.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/nunaburatebewe.pdfIn PDF document text
    • http://japhina.com/upload/file/bamazel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+sims+freeplay+android+1PDF 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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10796 bytes
SHA-256: fe3e7a505d410a131584da0ab42fdb0fd66ef1d03736f59bdc26a20c49b276a4
font_02_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 17544 bytes
SHA-256: f8d9fa7e8e74ee47b27bf7ed8faf409ae8582b70d2d057ab9a03dc74c61e4a54

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