Malicious PDF — malware analysis report

Static analysis result for SHA-256 c843ac275eb18eee…

MALICIOUS

PDF

120.6 KB Created: 2021-07-02 00:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69a0da27b2edf7ae63da133aa6d885cf SHA-1: 30c8d900a5eacf5b3e3888e8a9188f9f866f41c1 SHA-256: c843ac275eb18eeec71a7e057c0b48014dc3d7e5159b05f499d1aa6becc065b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://boathousebrokerage.com/userfiles/file/gusikepebevibexav.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mt25gg7ukk5j6cv1vplbctk486/vagegad.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf1e03d6a---kedet.pdf
    • http://smeeing.com/userfiles/files/vizotejutanukizoduwibino.pdf
    • https://cecprint.com/images/file/67310664139.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2e92badb1---lofolonezunilusi.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8c0c2a02a84f101aa0365bc56de5c78e/67920342966.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b5f1bb10f2d5f63b9864c3d1fd1d8891/tevin.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e760d6fc21---76887779283.pdf
    • http://telekommarketing.com/firme_data/files/fipumakibuzojovukivur.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/775fc059cdcd60bd7b8a5f9b11c1bf39/miremerirazojejexiwadufej.pdf
    • http://formel1vermietung.de/userfiles/file/luxodutixovipeze.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7da9544af2---lepidejogoruviwivuja.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/212k6nvuc9gfe1nvg7p301lq58/30206728316.pdf
    • https://allmassage.net/upload/file/20210507112711.pdf
    • http://suvagcentr.ru/userfiles/files/perebewotapofu.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/wisovuxapomololowol.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f332630bea---54134351302.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e723277d---49787609397.pdf
    • https://aprilboya.com/userfiles/file/puzixivirizi.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f754d2f6663c809b60500c458c3bb909/dipumipupi.pdf
    • http://antifftech.com/uploadfile/file///2021060805452511.pdf
    • http://bowlingkillers.com/imgdb/files/nefusolobifolojipasufo.pdf
    • http://aligokdemir.com/resimler/files/kezosexokebedoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=another+word+for+attributes
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000136e4.bin
5141442597a19edf1bb6a2b2996bc95a4f613b25754e3bba6e227d901b6e41d4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x136E4 23320 bytes
font_00_sfnt_off00011e02.bin
3c67be44db5d37012f07a1bdd4585499fcbf1c9b733863c6cc91de4764d3d1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 7208 bytes
font_02_sfnt_off00016000.bin
c8d707666a33165c5de32b1d04425d990b0d4408e539debd3226676edb049f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16000 10712 bytes
font_03_sfnt_off0001789d.bin
29cc0f9fbb64dd2421dc6475c7668dd69eeabc307feb719b2c650d479286234e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1789D 28344 bytes
font_04_sfnt_off0001bbbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBBC 16792 bytes

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