PDF malware analysis — malicious · 008a0d93ca9b2e8a

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 10:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 53951be69a99b6a9ca3f5cf7929aa2b2 SHA-1: af8e30d5e30cd76a564bb1f3ab7ce729d4706b30 SHA-256: 008a0d93ca9b2e8a3d3d1bffa3e95d234198bb0951ec8c5f7cc1181e15537f0a

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit vulnerabilities or deliver a secondary payload via these links. No scripts were extracted, but the heuristic firings confirm the attack pattern.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://wastran.ru/uplcv?utm_term=screen+to+gif PDF link annotation
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7a41c506---95873654718.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160973116f3876---40758354614.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe3779721---wuretulamigaz.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071779cbaab2---pazuwux.pdfIn PDF document text
- http://fundacionecla.org/resources/original/file/18949318103.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/401c3d26276818c1b739758db3639363/40357719189.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/56b7a44492318e5dbd1be3150f598876/bejovaroti.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/25fe47d238572e910552a54d4c778380/zotefizilegakokawajex.pdfIn PDF document text
- https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e554d16a0a8305bcdd5b3799ce05aa4e/votug.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/sikudiwekusanasotasatak.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/872e6d91d1ac161084e701998c756068/kavufanefolopifuvadaxiwo.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b438846b6---7914361429.pdfIn PDF document text
- https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/3ip8u2bof0n1avpdioakcc76o3/81060611108.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acc770bf865---23860702667.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726de9855b---77596359042.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099e135d5026---56865163951.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160776a7f16efb---supazeveriwewixabibaxobip.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8ef78dd9---rewinabuzuxagukem.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ec816135e4---kagimamerodexe.pdfIn PDF document text
- http://abpaluso.com/upload/file/24094128403.pdfIn PDF document text
- http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6nm70jj36a78kh72bjg7r19jt3/wekijuwizuwaligojewuwekap.pdfIn PDF document text
- http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/i18eusj2bhioh2udgcb9mo0ep1/vugifufivefatebivevogef.pdfIn PDF document text
- http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/vutirivasizi.pdfIn PDF document text
- http://romanakladatelstvi.cz/userfiles/file/52363850892.pdfIn PDF document text
- https://balbok.net/admin/ckfinder/userfiles/files/butobilabojugokamekelot.pdfIn PDF document text
- https://agmatbaa.com/upload/files/54260877502.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_off0000f2dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2DD	10212 bytes
SHA-256: `e442d21fca1e744dac5eedc1a0083fa7261c5e4e2bb693ccee0636a608411f0f`
`font_01_sfnt_off000109e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109E0	17368 bytes
SHA-256: `9e6bdac3f017c77c72f8ae18bcd84798f212bf4244c365929a39252406b3842e`
`font_02_sfnt_off00013779.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13779	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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