Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bc291c46885536…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 17:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16e43b2ea44d45bfd78756dfe2afec36 SHA-1: c39b3ddb5ab215a6b78f751eaad1ecb2ebdc2dcc SHA-256: 02bc291c46885536c1688df9b0185db4604fb6fb01ff1ae8cf24859680fd9f53
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rf7pblkbu9f4ailhf9bbp8okc3/81297142615.pdf In PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/mabokuzasidadipix.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37ef9da33a---75239388025.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/tosakexubobakozapeguk.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/xasef.pdfIn PDF document text
    • https://scalper.ir/data/files/file/sizuxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a197bea91---96658928357.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/34323218653.pdfIn PDF document text
    • http://askort.pl/Upload/file/8638699586.pdfIn PDF document text
    • http://innotack.com/userfiles/file/gizegutirilemuperapo.pdfIn PDF document text
    • http://szpk.hu/_user/file/95751151604.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/bozojigekijadubozi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f1ceedc4---dogurodutilewizukedabo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d037477cb---87155983322.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/xozigiwusaduxofigi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e503f3c423b15a4247f961184ad2d72f/31585240176.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/16991022076.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/xetopudomifolakikaf.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e463887342e---zapuwomezopasut.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/49033185811.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vanugojoxojinuredogen.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/balupasozelawojixarawemez.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/todegin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=phrasal+verbs+with+definition+and+examples+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 21448 bytes
SHA-256: 545be707f8e8db0a64c66c03cfdf8315bd7ec07e70347a241a5120c778966ad3
font_01_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 11156 bytes
SHA-256: 278d2ace706b6274561479fe303c73e53fb85deee0f492bc26b32b10170f5f79
font_03_sfnt_off000143a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A5 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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