Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a9b073efba3f31…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 06:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 6f080428abd99f561cbec155d2298589 SHA-1: ef5d24cc9bdf0489e9f916203588ee08c19f65c8 SHA-256: f1a9b073efba3f31dc8e1df57d10828a518dec084cf40b81850446d665d654e1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=diversification+alimentaire+b%C3%A9b%C3%A9+6+mois+pdf PDF link annotation
    • https://movingalpsfoundation.ch/userfiles/file/56308595493.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/finalaxujepofajekozitu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e56373c10817be9ca8e98a58cb2f838e/34076488585.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/74739643340.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b34806ba46641bf8969017f97ac165a2/92275187733.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ccef1d44---pusebotifanofipekavu.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/33629195715.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/43840385638.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/40929251154.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/90554723573.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a59bf3b2---xozolotewuxovagube.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/ronulemebogarupofukoki.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/nonome.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/7831160789.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/67445880812.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ca4fa5ab00c1642fc1ab9c57024967c3/79637826060.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca723b6a40---90114623163.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128af4d02741---rusumosapujagunolome.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/vuzozubelowufaw.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160813bb6c4f75---kawalekugijetapelexex.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/sozemafularetesapexiwur.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/62882cbf2c20d1cfe360b74eb2158f3c/kilexevokapezexaga.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_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 19988 bytes
SHA-256: 4e5905ef3b04818398dc1f8958d15e38d0a533bbfbc02ca3ced185b121120f1b
font_02_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 11308 bytes
SHA-256: 7646e86fc91dcbed32a5cb2dc53d92662264199c07e10e6b8cc3bfc82079b1b8

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