Malicious PDF — malware analysis report

Static analysis result for SHA-256 1545a0a340ec3a0b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 01:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c9efda803afbb1aa9faa116e52928906 SHA-1: 84f382f38803d0dcb32a92f7e0ecb7b84cdad3c6 SHA-256: 1545a0a340ec3a0b3554d364f99d7cfda46a7d7dbebda99a1a794ba1c7519cd6
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of a 'Download Now' lure further supports a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93352d828c---25543347230.pdf In PDF document text
    • http://servicedental.it/userfiles/files/robedipavuradiwivaluvuzu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098417d1f8ee---riporiw.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/26381027432.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vejadobejukino.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/rezilawomamaluwowodasu.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/35500846934.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/74416343065.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6904f55ce9---sogukegowuwopijos.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/vapumodanudu.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/kijolebumeli.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/87535062862.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083442494ea0---80067318425.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab78c5cbca---42341686497.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/833ae73dfa52591aafee69c297ad796f/34330993708.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c21b7d89---60250392173.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/xekod.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/1796110737.pdfIn PDF document text
    • http://vtaky.sk/media/file/fafedudolugajomofovu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fdfca1df37dfc8d2805e19d8772594a4/58761925168.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/23576959703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cs8451+design+and+analysis+of+algorithms+notes+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_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 11560 bytes
SHA-256: 9d9021edf4d83ce687a9d697080c13ad679318406613087011598a6b0fca31fa
font_01_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 18676 bytes
SHA-256: a18bb8a6d34ca341092aeb5929ba7c3366596af90ebb61897a63c487f338f4ee
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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