Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b799acc804d4035…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 09:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2907ac55a3e84202c06f1acc575e0f31 SHA-1: 460641f0e17a71a0eef5f691a698c8850e73a27b SHA-256: 1b799acc804d4035fa7d26822bc3454f37fda1ed9f0fdc01692070ab43011a8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many hosted on compromised CMS upload directories, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=honda+hrv+2015+owners+manual+australia PDF link annotation
    • https://mwasafat.com/uploads/files/damot.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1610921e95c250---50099934586.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb62b5d90---69631074275.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/21579156546.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/baa2b53f147757c267fbb5c40ba4e065/vevurozojumalagezusabaki.pdfIn PDF document text
    • http://haphadoor.com/upload/files/puvopunad.pdfIn PDF document text
    • https://bataretak.com/img/files/file/21212124625.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/81266071936.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/dexupekiwew.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ebdb123f505716ef01255744b6e8b45b/20708322565.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/vodebubaj.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6f8a1dcfd55bcc3b2c2ba7e1e8888507/posujamiremiwun.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/lsm8d4m72qk998v60mj7l8juvh/dosijinub.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/69053840965.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/zufibonezine.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/luwotinokijekumigumepaj.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/46511845811.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a33a3921---nebifodisuxeretatinumur.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/sexurunemakerofuloket.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/92985814a8e3bb414d98691d50bb0954/58815203219.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7ebd0046---moduvokizufakeravis.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af960697495---7756116369.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/44645173181.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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 18372 bytes
SHA-256: faa09f0382ee0c35fb4a6e305b388902b9ae1755ed18ac36e91be23f39bc4866
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 11184 bytes
SHA-256: 93abcf2ceb71386cfb7145ece24da877baeb22670a6aebe9c68910130c35c058

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