Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60837e068c18c67…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 09:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5ea3b89d0e3847684a7ace7cf725cc3 SHA-1: ba49d1509a156e4910e825d5c6895b41d3090118 SHA-256: b60837e068c18c67cb51d1a2a0960e91d33f615bacba7526fcc1b98e677b51d4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or unknown websites, which is a common tactic for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zenithoverseas.com/assets/userfiles/files/nufekusilirufu.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6554b5b14ccbb8fd0e86480498276d1d/48458396933.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wezunarevolasokafipaz.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/wujevugiw.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4949959039b8449bcab9e45b5704d012/fosapilezirunemexomelig.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/vogojizoj.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/dakizerefijuz.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/45300653593.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/mavipegulofagejepi.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/jelabos.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/voxap.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/mananirulawaxu.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/9408514863.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/30165225614.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2785f1dd971e1311de6e112e805ad51b/jusebapu.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/51847376311.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67204119228.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/wifekanisuwokoron.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/30510605916.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2050cfea---tomusetojajiwizonuda.pdfIn PDF document text
    • http://citranco.com/users/files/lofogefu.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/37815299873.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/perumoku.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/resexitupewi.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/pekidakiwifusipuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=simple+tenses+worksheetPDF 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 10608 bytes
SHA-256: 0ec2200f20f95ed9f7bdc4a27ad336e6f8feb6f75dbd854f48a544960ebac513
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 16960 bytes
SHA-256: 0d1a5869eedd9afa75c7cfb2ec5a42e5f3a62e50e5b8ae55fe2363c84b3ee2e9

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