Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f12cb338e6a685a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-02 12:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80f148381a371c301120c639ae8b05e2 SHA-1: 940426a43e931c818436875171ed3afed6a0eaa1 SHA-256: 5f12cb338e6a685a434a500e94e3ce0405158fa5c5011254ec096b22eafb3d16
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including a screenshot image and numerous links pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links are likely used to redirect the user to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://alice-immo.com/userfiles/file/vebejosojulogapimelorewex.pdf In PDF document text
    • https://aslimitada.com/userfiles/file/vimijapovemuxopufejisa.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/minasokexuxomasixe.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130403a5e628---buguboxep.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/gadobo.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/61932781563.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093e78a5cb2d---pulodedesenatizefuf.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c951a9386c---lexomafa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e04b6a659c---fubuvizazifukanuvaditi.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/jivogakajowanale.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lizesetuvusuvikoxuv.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/31193794286.pdfIn PDF document text
    • https://samowar.ch/upload/file/jivivoluwukoxube.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/3b0spolgnsne0m5foudt5daj8c/52388193331.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u61frnpjd2k6194s42q33h6ru5/42390693081.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/wijabubabewuginabujoduzet.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081971404320---sosezezu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e3a4c0c68d1405424ae1f10914b4df14/piximawomasisitekaluzika.pdfIn PDF document text
    • http://immopolignano.lu/images/84026783704.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/29c8a9b3c1e8a572ba2e9dd47acbd1ae/66109041199.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775dd67f9df---58604299690.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3463d4360---5139420467.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7f37532c9---mamosid.pdfIn PDF document text
    • http://standardamulet.com/files/files/69440557805.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/64697942548.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/4437654435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aerodynamics+pdf+downloadPDF 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_off0000b52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 14236 bytes
SHA-256: 38525c59686c6fc735f1bac075e307e9ce46020e72c22b77c01abd6827186b89
font_02_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 10864 bytes
SHA-256: abcbddb70f9d7b059e640677dfc66a0ca2cb2f4cbd96c254ec073cd32f01ceae

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