PDF malware analysis — malicious · 08aef457c867672f

MALICIOUS

PDF

74.1 KB Created: 2021-07-01 22:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 29c7572ddc9560a67b73884017b2cb0e SHA-1: bd2d563d78a8547aabb24903699dd6b4530c5299 SHA-256: 08aef457c867672f9d9c8d2bcef540b6df1484e64a20e69b22cb3b0625f72b0b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The PDF_URI heuristic and embedded URLs confirm the presence of external links, likely intended to lure victims into clicking and potentially downloading further payloads or submitting sensitive information.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://krisoc.ru/uplcv?utm_term=claim+electricity+working+from+home PDF link annotation
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0ecaefcc---20803527721.pdfIn PDF document text
- http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/nampbus6sb3ulhlt7312fatjpb/94271921199.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/127b3cda5127bc1302b5f89cb3177931/wuzixikonilenev.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/inu8vlip2nl6l0o2jb4mt8ne0j/91053990091.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070036286ae7---dezazuvujowerurop.pdfIn PDF document text
- http://abwingsbuffalo.com/uploads/files/rirebebefakut.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/i1d14ropotsiodg6vaqh7c5434/22984365238.pdfIn PDF document text
- https://happycolaborativo.com/uploads/files/pilig.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/152v5i1ce49hbmghosaibog6tc/kosujibejogelitovowap.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/493820280051247d981171229f70eed8/fepisuwuvolonox.pdfIn PDF document text
- https://infypos.com/infyposcms/media/96363488480.pdfIn PDF document text
- http://bike-aholic.com/UserFiles/file/zurakilako.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16076bce441a42---sesizewaxidat.pdfIn PDF document text
- https://hgb.se/filer/file/78416891559.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/vewofujaloronewidik.pdfIn PDF document text
- https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/856b83ae01c8e6d788e2671b5544d6ce/besexamuxovilez.pdfIn PDF document text
- http://webursitet.org/Files/file/84389098802.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d19d3068b---jebojazev.pdfIn PDF document text
- http://nowyhotelik.pl/userfiles/file/koropibexurikoke.pdfIn PDF document text
- http://khiconghoixuancong.com/Khicong/admin/userfiles/file/pekimi.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pjig7rmdn10la17tvqtpc47shp/boxeranamewemikalefizoga.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094352d34348---wivapubaranafelu.pdfIn PDF document text
- https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/922278eeb7d92e3b79d9dfe6244ff90c/32622652782.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b386dbd9d---10219213517.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c293.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC293	10936 bytes
SHA-256: `4e80aa6fd6a1a6ef8e05adbc595b6c0a37f95ba1396c882a0eefe0c07bcf6a3a`
`font_01_sfnt_off0000dbca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBCA	15504 bytes
SHA-256: `4d3920ea8db8bebcda2ac8a576fbf6d237aa5620ddfe8afa625305843b0c2585`
`font_02_sfnt_off00010343.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10343	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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