Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e162e17e1747a6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 12:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ac117627e867a63a91f49ca6fda98ca SHA-1: e063b17714b35ec88b481907e096273523992c06 SHA-256: 66e162e17e1747a6d838820883a3db20ecb3615d2d22eccdcad3a97844ef0510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm that points to compromised WordPress upload storage, suggesting it is used to distribute further malicious content or redirect users to phishing pages. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a 'Phishing.Trojan' indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607709cb7de7f---ladopuzi.pdf In PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/40612539183.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/46602611796.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/38426224213.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///65865387874.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/601a0afc9083143c34c545afdb8e1af3/4024206532.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0778d5ee05---98727750914.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5b70e462f02e52c30f03060a0ba8b831/zakadujojawunakizeziga.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/43599326970.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/topanokigufopidobuzusugu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/molopitegumusofabi.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/44971452316.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9rcrv3o1gu8unipompgd0c08s1/23801857820.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/kazinirixuxigiriguvap.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c10c66c87---gotupenotevexobapebu.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/gijuxiwuje.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/38392757096.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fb0cac67---wujegukakemu.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210803001052_xo9a0k.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wosotuzug.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/jepalodejazidano.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/85528372485.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/6051136270.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/8863060128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=punctuating+titles+5th+grade+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_off0000bef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF7 16248 bytes
SHA-256: 9b845acef9964c7167e7e70c0fe17e4976a3cb2ddddd7aec4994f62396c65ab8
font_01_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 11064 bytes
SHA-256: 05a26bc76b81f66005fc7037b473847846ce088bf170ea4e394a413b1b777ad7
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1