Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c53ae2b2a086bc6…

MALICIOUS

PDF

110.9 KB Created: 2021-07-23 02:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a254afec655f3c2736275e5431b06f3f SHA-1: 174a39a835f2323d69e2cb1765886bab616bd2fe SHA-256: 7c53ae2b2a086bc6d3386ce1b5b73b3b1633808345bfc9c4fe337b4adde24f4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of numerous links on potentially compromised infrastructure suggests a broad phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ulpaikqsndhcmm50m80mafsm5/mubokab.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712081426e3---25149004252.pdfIn PDF document text
    • http://ruresept.ru/files/file/17892564928.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/64189318184.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9ce0c9fb76551815b43ddc69d278ff8b/votuxe.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210720_BC01366A96A11936.pdfIn PDF document text
    • https://cape-electronics.com/media/file/63277790445.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7d18cddf92ab9d3942c49c8d7ffb955b/pivujefugo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088790a43b42---ruximegojepubep.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c4d22b79a41b627409b068b1b96c2a4a/70765583824.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/l5cki3kd262337577ngb619df4/nilabu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609568f50b3ae---vesuretagikodofatuxetus.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/12324156518.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6375e599f2504689e1e9adc97f293331/fimeken.pdfIn PDF document text
    • https://123natura.com/stockages/files/56711425851.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vg9ppq8k9o26tab05f4hjne466/1935312075.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160721548da4ae---45144785145.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eac484a73---tatiba.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072429624c17---xaxumanesipozelowuwi.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/jefid.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c57e99b5c5698d2824d04e6e1d16de2b/2033339850.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/7413416787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sad+monologues+for+kidsPDF 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_off00014f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001672f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672F 17484 bytes
SHA-256: 27b78f442372e2b81fb64a9f79abbeabd863bfca39b782a1543d60d75a249f68
font_02_sfnt_off00019413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19413 10864 bytes
SHA-256: bc182e7b6c84c3e96589c7f9589914438d4e8e0f294ebef010c9c004f8624b36

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