PDF malware analysis — malicious · bd836d6d96930003

MALICIOUS

PDF

92.9 KB Created: 2021-07-14 08:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: d10edd46f20268dcad6ead4b2b6565a9 SHA-1: 9114e0c0245c1bf43af4995db3ffb609e7536980 SHA-256: bd836d6d969300038fb9a6cbfee174e70d1e4bd1ff2e2ee551d143888add1441

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to lure users to malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent beyond acting as a redirector.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://drafthe.ru/uplcv?utm_term=after+we+collided+subtitulada PDF link annotation
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bff2f994e9---19955371963.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4cf968ae---18712753697.pdfIn PDF document text
- https://www.indoorclub-informa.com/boletines/img/file/54430140146.pdfIn PDF document text
- https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0fe011b78fa03d6e8182bc2a8e66375d/64888028303.pdfIn PDF document text
- http://rydelko.pl/userfiles/file/51497083310.pdfIn PDF document text
- http://houstontca.org/Content/uploads/files/54053160051.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/851d276ba1741a5066a63abfa6fba3f3/lurifopozibedenuvatul.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b074a1a2bcd---81158630957.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b82a8a66d172c97c71cea51d4b0f081b/wowezawejapajifekijewibo.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nuqkck6umv1buhi0a3qn3iccdq/xumabiwim.pdfIn PDF document text
- http://zonweringbelgie.be/ckfinder/userfiles/files/85129228489.pdfIn PDF document text
- https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/839c00p0fk8fp3ass10f324eds/vudejerodubibu.pdfIn PDF document text
- https://apoiotelecom.com/imagens/img_fckeditor/file/valagosesapinilopowa.pdfIn PDF document text
- http://rebeccafantarchitetto.it/userfiles/files/katomufosodipesufi.pdfIn PDF document text
- http://hocikto.info/userfiles/file/39303480213.pdfIn PDF document text
- http://zoncmswebsitebeheer.nl/files/editor/file/66516974258.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a300ba64bf---gowovodubetamosule.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd436b15496---woleda.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/re2i7cvg2k4gtt5g2cqe85fvcm/42301549744.pdfIn PDF document text
- https://zweefvlieg.net/userfiles/file/semefobadadelud.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2d7436c5---wodemufuregododu.pdfIn PDF document text
- https://angkagenap.com/contents//files/92781060147.pdfIn PDF document text
- http://mppscstudy.com/admin/usercontent/file/2526877011.pdfIn PDF document text
- http://bmcnx.com/userfiles/file/lakukujuvirilisoxuwosap.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/586a3123865560fa5c47604feaf2ee2d/wodedufa.pdfIn PDF document text
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f118.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF118	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001092f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1092F	10672 bytes
SHA-256: `ece67808c4c1012aa3ee2d93464a5fcd4b5f9b444bbca5052b2d094c90947db0`
`font_02_sfnt_off000121e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121E0	16192 bytes
SHA-256: `bfe64e3d917f904c536eed845c8da68738fad92952cf9e53c7c08a5e2fa48a2f`
`font_03_sfnt_off0001379b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1379B	17724 bytes
SHA-256: `bcafd08d211e8fae0c8f1929d098e00444f9c55e7df2e85e1c25742cc66ac7b6`

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