Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d88c5997186cbf7…

MALICIOUS

PDF

168.1 KB Created: 2021-06-25 23:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17945dbc7deadd2c928e70921ae8f128 SHA-1: 53d3dabdf876e92e8da412dfc540b522cc48c175 SHA-256: 8d88c5997186cbf79f110011ffa69e2867efd2cb43cca3d4acff07b67cd1f17a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL analysis suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/sue93gvbsc2vo7n87b4j6pbhim/gibolafapimizuvamulofug.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0a65cee0df26fc642355be18549781b4/gejinuxamovanudenos.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160727e0d06a73---paxirazapebizu.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/17f3d572622c8be68eea4d270a1a9097/voxijedirewajaxewegexawe.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1315e992cb168cd36edb2faded866dc5/fosogi.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a9e745aab---14165252087.pdf
    • http://pphu-joanna.pl/fckpliki/file/8558060331.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6befddcd26---janunupatapiposorurazomuv.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/45625b3a3ace8e851a1dc57b31bddcbd/popegizunesimow.pdf
    • http://geose.ru/userfiles/file/61428455125.pdf
    • https://hagepoorter.be/files/files/34708224649.pdf
    • http://lahma.pl/_u/userfiles/file/vagezis.pdf
    • http://megat.pl/uploaded/fck_files/file/2749346477.pdf
    • http://alibabashipping.com/userfiles/file/tekob.pdf
    • http://bright-mineral.com/uploadfile/file/2021052204255112.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc2547ada---98408936876.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608114422c1c7---fagaxetedowunizesuxomad.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b7876ef2e1ad1e4effd9920850aeba01/datofijenedukebal.pdf
    • http://parbatsamajjapan.com/img/files/files/82994011092.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/430aa54e050cc1c335d9d026ee7bc1f2/taxazotebagemo.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607902f87d8d6---jiwexekulubusureta.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8a73b7b9---bopevazububona.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4475c00ddc---77366482036.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a4+paper+height+and+width
    • 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
font_00_sfnt_off0001ffcd.bin
cab8ceee6dea85bf437db9fdd562b8a0aef74c4066cefe7f2a83a632bdc35db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFCD 16072 bytes
font_01_sfnt_off000214db.bin
567d63ca94c7a54dd7b841410d7facb3f4e9c62235c558791116580923894b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x214DB 10480 bytes
font_02_sfnt_off00022c85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22C85 16792 bytes
font_03_sfnt_off00024492.bin
9564bf6710cfb0aa930dd64d500fc134b3aa54bcebb0f1827fd8e03182530fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24492 3088 bytes
font_04_sfnt_off0002510a.bin
179a27b4eb8bd4a79a3233569497d953874e6f47cc79d614502d39d904cebdd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2510A 25488 bytes

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