PDF malware analysis — malicious · 5d0061177c1846d9

MALICIOUS

PDF

95.7 KB Created: 2021-09-05 11:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: b919d26aa72e488a4730893786c60ee8 SHA-1: 39275eae88097855743643906df637c79ca2ad7b SHA-256: 5d0061177c1846d92cc708660eff87519c46abdddff2e0a26ec7a567849f6c41

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://queure.ru/uplcv?utm_term=sdg+4+education+pdf PDF link annotation
- http://exhibitionchannel.com/upload/26847009772.pdfIn PDF document text
- http://bociany.sk/media/file/givixijazuxis.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/b0560cf60d6a2fac513308bcdf6c36ba/46221873784.pdfIn PDF document text
- http://studiotecnicopetrillo.eu/userfiles/files/goleguxiwelakozugojibo.pdfIn PDF document text
- http://meadescafe.com/userfiles/file/fizipe.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0a1bc75217243eb269058556e9462bf0/pagiwuwalifurinatilewajef.pdfIn PDF document text
- http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/pumilamoxomesepa.pdfIn PDF document text
- http://phuocthuan.vn/images/pic/file/95777296622.pdfIn PDF document text
- https://mdteam.se/ckfinder/userfiles/files/5250771057.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670faec164---35807381369.pdfIn PDF document text
- http://z500.si/files/24980652705.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610db31f91493---likepurabobebipididuropu.pdfIn PDF document text
- http://airholic.com/UpFiles/WebEditorFiles/file/vokaromewoxuferadi.pdfIn PDF document text
- http://maility.pl_adresuserfiles/file/35105718659.pdfIn PDF document text
- https://kitapkapla.com/upload/ckfinder/files/83279326418.pdfIn PDF document text
- https://tcremich.lu/files/files/lerinawosipepab.pdfIn PDF document text
- https://aonetreks.com/uploads/file/segibipoz.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608222b3e94dc---48273841799.pdfIn PDF document text
- http://remont-elektro.eu/archiv/file/fidegaxiwipaxegakodimuron.pdfIn PDF document text
- http://capesociety.ca/uploads/files/jukofowosiw.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d1e97d9cb---sadonoromozuji.pdfIn PDF document text
- https://najlepsze-w-polsce.pl/uploads/43012557103.pdfIn PDF document text
- http://berbun.com/user_img/file/rasumegojexuxanajivexom.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf7df792d6---1242136560.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_off00011117.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11117	10736 bytes
SHA-256: `449e8380e720c89219edd32c3072eabc3b24cbf629e7365c0f16c342a1420e66`
`font_01_sfnt_off000129be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129BE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000141d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141D0	18428 bytes
SHA-256: `492d54b071bb53bf0bab5dea76338870f109f508b867ce802359ae2f9bbe2445`

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