PDF malware analysis — malicious · 637e0a66f219aced

MALICIOUS

PDF

87.3 KB Created: 2021-07-09 05:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 6c4f07685f5bfd6b3a6403af3de259d7 SHA-1: 904351d6e498f2be2b693ddb287b79a4c8824c79 SHA-256: 637e0a66f219aced64f85bc3be9ddde8fce23fd63efd5bf5b2e950d0c630cd5e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea8723b74---jevaxanakelug.pdf In PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a762c0dd85---43278498630.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pa4bjbu4vjjuek2cs3jfgmdaa3/27187974544.pdfIn PDF document text
- https://habibitours.net/ckfinder/userfiles/files/76532779229.pdfIn PDF document text
- http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/35889808294.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8da56f167f0f8ab9fc1043d8e5f80eea/8155496388.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0fb74ecfac05a62dc62cd8716629c61c/13203021485.pdfIn PDF document text
- http://baschin-heizung.com/meineBilderAlbertGrundschule/file/36576452743.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bfb8d5a785678b7ce6bf0d0e20467f9e/84136998238.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/20a48c38f6b234b6364861fe4af9616f/gagazerorolitimimixi.pdfIn PDF document text
- http://wawa757.com/uploads/files/tuxevir.pdfIn PDF document text
- https://hosvagyok.hu/userfiles/file/2483966193.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882875a4ed3---47349975151.pdfIn PDF document text
- https://tasleemdubai.com/userfiles/files/31301868043.pdfIn PDF document text
- http://xtra360.net/campannas/file/50859564530.pdfIn PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3cu3jr39le04u7gldv6fkkhji1/95837443773.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bmvhhhqea6vg9aj9l933pjoq11/laledasamarowegewedaxi.pdfIn PDF document text
- http://axiomestates.com/userfiles/file/nufajunelugizuja.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b8450abf---76697042092.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160713952ee8d9---xilojigudaji.pdfIn PDF document text
- http://agendatourvietnam.com/hinhanh/file/76706729464.pdfIn PDF document text
- http://businessdevelopmentcenter.pl/uploads/userfiles/files/kuwimarotisore.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/da8d6404b357e7462c67993de0fc988a/5108585351.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da437c6fab---jozeniturerixebejonemakef.pdfIn PDF document text
- http://praxis-greve-polley.de/web/editor/files/47779179945.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22ccc097d---togixezanomap.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=code+blocks+with+compiler+for+windows+10PDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e329.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE329	11248 bytes
SHA-256: `09c522c6c9477ff653b50bb0313fd0ae04db3ea878cce0ababc020dc0829df93`
`font_01_sfnt_off0000fd29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD29	21892 bytes
SHA-256: `c3c5c5443189a8b361ccfe54138afc21a98befd0a51c5a96c29d50b920739360`
`font_02_sfnt_off00013539.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13539	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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