Malicious PDF — malware analysis report

Static analysis result for SHA-256 12836801bd3b71fe…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 01:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 947a30aec286182b26f64a95e1c0842d SHA-1: e43ab612a98f8a0f0227260435f5865bdf5548ac SHA-256: 12836801bd3b71fe31ae00e572bc98eada22e97bffe0cdb397dcef5a8a787406
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kartelabasligi.com/images_upload/files/faruwafudafigogag.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7pamnci8r2o1qi89o8i2nj1t25/59800748301.pdfIn PDF document text
    • https://dm288.rs/slicice/file/kovujoronujepajepivag.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5f1a94f4bdaad87c8d0e226519f69f41/kijugofew.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/12471051389.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b477f652bb6---37667149709.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/85295124436.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/65427964870.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/80953524628.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1ecea427236b299ecea4e8f4d83e5d2b/wotazogodonujebapuvotix.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11623103624.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160858ba990bff---74088911417.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/16433230915.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/89121861805.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5fd31010b---kajupokovurexiwapadina.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/11740862218.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/23275301600.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/xovunigunopo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4813dd1cc---25077084625.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/rofuzoligumafut.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/mozojepafukizat.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/jerowubidetodoliba.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f67d63201---tekesilaxesap.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/guweduxope.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210814_421E5DA98BCFD661.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3b3bbb1037211483108de9ba80869023/65760646217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=computer+programming+basics+for+beginners+pdfPDF 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_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 11188 bytes
SHA-256: 9d72fe4617b4c81e42a4c8988d98aad2d4605cd3c51a09afda09f97a3a63c1e6
font_01_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 17064 bytes
SHA-256: 6fdc27e8c783535a49c9e7f6abc2b22c51faf0fa143145e3f255ed9d629a8a7a
font_02_sfnt_off0001365d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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