Malicious PDF — malware analysis report

Static analysis result for SHA-256 7369f284825c5be4…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 11:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c5cf05860e3b5edc8dea5d83588a0e8 SHA-1: 10c66fd12f53928763dff148874a37aa49c098b8 SHA-256: 7369f284825c5be4ab554ee19da1a43e2328065cd9f04b5f7e7092f62d4ed9b4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a malicious intent to leverage external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://batikatravels.com/userfiles/file/zevurozoridije.pdf In PDF document text
    • http://orchid-daikanyama.com/userfiles/file/xipabenapezizesekaras.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/23992194804.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/da1ls9qt99spkr2hjqp9j2i6mv/9666291996.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b55b6b2b69c431aa16429833d68b63d1/faletag.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/nowumitufumuwenuzabebev.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d511d8710efa9b39e3b550fdad84476a/26773789541.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/82d0ohh1ud421q3kdveh19iuq0/mujutagigimexepog.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e41988ecbb5700abda43c59b8de79a77/gofupafoganujukokurakim.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e0a675190---lagepekevubewa.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0n9gsabcqvbp7mst1e8ql7oubr/liratosomoda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54b118f761---30440200700.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17dcc7fe0---zenun.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0be28268---bagubufipiwefevukexid.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/refin.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6fde1b40c---58532759922.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/36474097329.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/97874cddace8b6fbaa02c43c1a0f28dd/77970197114.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/dawepazexebosawasijevupaf.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0cd309f3beb2dcc3cf84d7a8e5c299ab/17811703924.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/jerowevudewefuwapi.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/a56652135662741849fc8227333439a7/31122618803.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/kurigubaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=spotted+mountain+horsePDF 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_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 16828 bytes
SHA-256: 08cd242d7156d48ef62966db47da40a1a92d84c8e1cf68c3d27b7f82d24eaa08
font_02_sfnt_off0001306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 10788 bytes
SHA-256: e3adeac0c91d57b6f8f722924ddab445c2b2aa5419bb7f91dec41082957a98f7

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