Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4a3b97a10cf4f5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 15:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac5fd3f8d23d3e9ca739aeb8166835de SHA-1: dc42745c7466575c79fec9ced27133fa749e76aa SHA-256: aa4a3b97a10cf4f572c2156b3de2468d604786dbfd08e7e519c9b2d3c8810ff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=hp+300rb+android PDF link annotation
    • http://atomicattack.com/atomic/fckimages/file/gotivosomusawo.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/31237206851.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/sesovu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6514bcdb5---54801021003.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/kulofukemel.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zemukow.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161311fe703fde---xotusixuw.pdfIn PDF document text
    • https://www.confirmedtour.com/files/24408841589.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/10173279258.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/20901247696.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/85708943455.pdfIn PDF document text
    • https://motecx.com/images/file/vuwifesasoned.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/26552973734.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/gotujamosuliretegabuk.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/kisogumerero.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/fasesuzexaganetivesipivid.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/91817206990.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j5moe9j839f6sq1abuvkualpt3/pofazifozofagefemapotis.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/kegoxiponopizuputipel.pdfIn PDF document text
    • http://www.polni.si/Images/files/zuzunizupu.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/23709612579.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091122055273499.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/84532881862.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xijemekunoded.pdfIn PDF document text
    • https://mytopics.it/uploads/file/tuxidutabegakegowakebi.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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 10364 bytes
SHA-256: 6c833337e02bf27b9b84bac0c40e0d12c78484bc2ed1c66a5c476d86eed43c10
font_01_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 17348 bytes
SHA-256: fd108cc3bdeb01efaf949ee9265dca92e995210003ee7f3295c80d810c3ede09
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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