Malicious PDF — malware analysis report

Static analysis result for SHA-256 58170c58e039130a…

MALICIOUS

PDF

75.1 KB Created: 2021-07-18 16:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 149980dccba72fa7fa1ffe84db533630 SHA-1: 17163ac3e9854f8562e2f3f00e63adf5b297e790 SHA-256: 58170c58e039130a5de0c2dfd12a05fcc0c4b9122d5883ebde1e73a74699d1f1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external URLs. Several of these URLs point to compromised WordPress upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://sierrahighalumni.com/clients/878712/File/fexijudimozowiwitu.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6g2v2jbb7nc00t6oc8c0mlg7n6/fatun.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ehtvhgg6foc5ags6fca04r2p1u/47767912173.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955654cf1d3---lobupusavuvuf.pdf
    • http://nguyenthaotech.com/upload/files/tiporamanokukaledidemimog.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071becf80dad---33077489258.pdf
    • http://propellerclubsandiego.org/uploads/files/mekopufevaposode.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1bbba9b9---tolelewanidazolurewetub.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1hneo66vroncq7tq38ml8tnk0h/lefitarukivimebir.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4f18efc4d474665461b650254f3a207d/24667499242.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/tnhld840q6q27ugc2apnl3jvbi/tebejawidakodoren.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c70af31aa---pamakavozu.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092e48164b76---levinogujibezawifonugu.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078147ac52c7---zajoxeropetasanazoge.pdf
    • https://atlastoursntravels.com/userfiles/file/76564847501.pdf
    • http://hysansam.com/fckeditor/userfiles/image/lufofimebixulaju.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90b85dd052---velumo.pdf
    • http://autavrabek.cz/obrazky/file/38326379992.pdf
    • http://ccsl.asia/files/90596065008.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee4ce5150be1defb9e2be1d5b1da1262/kizovu.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/torapip.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759e2121822---22856937052.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57bdf91a39---dowagodupuwunibanugoles.pdf
    • http://pokeocncafe.com/uploads/files/kelosolute.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pinoy+tagalog+dubbed+movies
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c308.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC308 16792 bytes
font_01_sfnt_off0000db1a.bin
df9347073af946dfe48d16dbe943259757c21668a7f25622890cb2715355baec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 16496 bytes
font_02_sfnt_off00010631.bin
39a4cb8d134ad322503c16ef5d4abd06ce15ead3caffda911ada6e96c643cf61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 10912 bytes

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