Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c03e4d77dfcf58…

MALICIOUS

PDF

86.9 KB Created: 2021-07-22 16:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e8efdac89efdeeaa335b8f2f4a52f5c SHA-1: cae1c8d1209fa9bd9ae2dc6a20b1d41ec0b6c150 SHA-256: 43c03e4d77dfcf58dd0dec2827429956c728df050c2896440d18627d2faadc8a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b30d4cd1171396feaad7a2e9d013ddc5/68559689398.pdf
    • https://cengilli.com/icerik_images/file/kobaxoxew.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160918b4430234---27754075361.pdf
    • http://mrpokedb.com/uploads/files/23958902037.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t50bsio58dl87dvpd78l7tmi51/934183386.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/632412165a38fd0408d9b3e242eacdc4/mezobituju.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/naxob.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f84056ad9a6---tunafipofatomeb.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e124472dd7a---66542432211.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/njclsu9k7ts70dnuacvclkrp53/1183918960.pdf
    • http://anandtouristcorporation.com/uploads/24426325928.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m97jna8mek6kjemq86j8kjlql2/tedaritezetu.pdf
    • http://pogotowienaukowe.com/Upload/file/tokuzobi.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4979a448---58390405256.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1b637b7dd34ed9e42c4284f5ba35aa0f/93112984771.pdf
    • http://amdind.com/userfiles/file/vakifodovogenafivine.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b303ffb4971---95318108830.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5ab5db518b0a6f170cc0012c7b89087d/62189096546.pdf
    • https://nutstudio.it/userfiles/file/6121016666.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/e250260be9e40d1fb2ea788f7773a0fd/samedopodegude.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2745e028264d9be38e8ff33317c63b20/38348773133.pdf
    • http://bulk-supplies.com/userfiles/file/bolevufifemevowopap.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cnbi8ko9638dvaj6cff41t5l30/97861671288.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1247c513---xuvirupaluvopivemotibiruf.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab0496f7d---73153575056.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ff14+changing+class
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da43.bin
cc6e3aa6e8d6cc5789067ae71bfbaa4720caa7417e3242013eb6c2db9ab83ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 17272 bytes
font_01_sfnt_off000107a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 16792 bytes
font_02_sfnt_off00011fbf.bin
824e1def813dced2839bd4f26fd285048df8c3536bb7f23d7101ba7a6195eb91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 10272 bytes
font_03_sfnt_off000136c0.bin
4f2a9a26ae94a9e4f3ec726fc0ffc7e1e6ed9edd0c7cee3f16fc637664c46f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 16324 bytes

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