Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de6f725f898a246…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 07:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dabfb0d5a4b5c2eb80a6f31b3e0f5818 SHA-1: 8adec32f0d35409b9fd195ba5dfca1d91e6af006 SHA-256: 1de6f725f898a2464fdef1663d51d9f0eca3a1610aaaebdf8841c001ce1bfaa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://carolinevlieghe.fr/images/file/xixorunodosezejarir.pdf In PDF document text
    • http://kemnhapkhau.com/upload/files/21106999397.pdfIn PDF document text
    • https://huanghecables.com/d/files/29012189419.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ece7e4d5---91419756721.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/zawekelogusajegosa.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/47776137148.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/vimubo.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/povuwuxulij.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/37375242247.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/70278690593.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c71343145cd25bb91bc019970d8fcc8e/63989500850.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466d5bb5243---tewulibewulimakabufe.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/57832165441.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/rejatitiviliwodam.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/53407593297.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/ketipatitipuzagixikukotu.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/53760599023.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/9304140056.pdfIn PDF document text
    • https://31app.com/userfiles/file/11815199994.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/zutekutudobupajitefal.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/2322076113.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/14612520719.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/vofupib.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/lawokunulubetuze.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/29931571702.pdfIn PDF document text
    • https://zagi.hr/files/77259726076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+cast+mobile+to+firestickPDF 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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 10700 bytes
SHA-256: 0039cea2d27c38d40b81bbf4f59dee37e4e1f7c5ab37760ab7b8bd0a8c29d9c4
font_01_sfnt_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 18612 bytes
SHA-256: 77cecadca6358ae52c90661f4ce1a544535992d6034e83835141c2096fbb2cce
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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