Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7604f2239785442…

MALICIOUS

PDF

76.8 KB Created: 2021-09-27 08:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5bcd9e25a1a06ff7d88160b7176d7a32 SHA-1: 56610f7eac0ed75e8a95d5829f13d288f3349699 SHA-256: c7604f223978544235071dc105521feed27570be8881512996ea3870ddc467f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=how+to+restore+app+icon+on+android PDF link annotation
    • https://ikima.fr/uploads/file/wasixu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/915e37d88a097feeab0e5936d76b3a64/fewolojopomosa.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/97627693412.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/62515244750.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/84649848950.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/kirakasokuzuzewuvedelixur.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/kuriwaludoriga.pdfIn PDF document text
    • http://a899.net/userfiles/file/65000336222.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f480836560---bowolananidazex.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/92622000031.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6tmdp86etrc430cl24979s98ig/8952496268.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109210549114352.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/75338395946.pdfIn PDF document text
    • https://5udua.com/contents/files/gelavimenusivuwovazatep.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/bokixatorejuf.pdfIn PDF document text
    • http://i-dron.cz/data/file/tubokubiso.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/gegux.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/94959430023.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/zubiberinaboxuf.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/68054306740.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/5079434080.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/85882471829.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/wafojateze.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/52382321688.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/20258243092.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_off0000c3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DC 10536 bytes
SHA-256: 69045d1f8889fe00c886c0f8af7b91e25a6a0709c104b0d4a9b78468455f9a44
font_01_sfnt_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 19276 bytes
SHA-256: 42746fa78a4e74e46df867276ebe7ca35fcac2166b5731a040445abbf99c9350
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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