PDF malware analysis — malicious · e937bf8d01ecedfd

MALICIOUS

PDF

77.8 KB Created: 2021-08-06 18:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e3ab7553060101536c99151ae0180ab4 SHA-1: 712ac651df24461265d1b4f06ee4dea34167f555 SHA-256: e937bf8d01ecedfd1070e9cb5ad81152ae40b9ab0f1d50132620a10866b3ff86

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9931

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://catamma.ru/uplcv?utm_term=juegos+de+domino+para+ni%C3%B1os+de+preescolar+para+imprimir PDF link annotation
- http://brightwayconsultancyservices.com/userfiles/file/tanepazuwedogix.pdfIn PDF document text
- http://www.prctech-th.com/ckfinder/userfiles/files/79543822437.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/df3jk77sj8uqeuel6gk1g4al9h/75170728448.pdfIn PDF document text
- http://elisa5888.com/shopadmin/upload/files/34557783339.pdfIn PDF document text
- http://sutphinsgermanshepherds.com/clients/21958/File/89458053676.pdfIn PDF document text
- https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1debf15d7a---zadikivozised.pdfIn PDF document text
- https://betenagro.com/sites/default/files/file/62961529114.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/1872197543.pdfIn PDF document text
- http://abwferrellpkwy.com/uploads/files/vimajebipalebikamomop.pdfIn PDF document text
- http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/25m0qvu3p8fo3bf7ml135choc0/7667379923.pdfIn PDF document text
- https://gagiongvitgiong.com/ckfinder/userfiles/files/14988008329.pdfIn PDF document text
- http://toeicspeaking.net/_UploadFile/Images/file/zepipiwixofixefofebur.pdfIn PDF document text
- https://psychologgia.pl/Upload/file/1240597300.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5783104a9---5261306495.pdfIn PDF document text
- http://www.radanhorse.com/resource/files/figuzowudaxinexes.pdfIn PDF document text
- http://exosportsante.fr/ckfinder/userfiles/files/59344514131.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e71f04f11---58277230985.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7df982f3f---xuvakula.pdfIn PDF document text
- https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/555f58c095c1eb376082ff2fb29bfa79/33501925356.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab4cd297c7---40720254014.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a157a9025cff074f30e3364a1096ec4a/tujowasobigubaka.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf7d5b76c---wixipobazujezadeva.pdfIn PDF document text
- http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6ad74f63---wofoja.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b07a127d---84631798623.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2e2da636ec753fa2a1e29ce6da2748e7/7998758138.pdfIn PDF document text
- https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/7035e26f4a18eb6297f50c0f41905c22/xuvovufivinalusoku.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eccf7c1ec---livebefotuvojasinajewagon.pdfIn PDF document text
- http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/43709216610.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_off0000cb54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB54	16228 bytes
SHA-256: `9b723e71a6f1c17923fd4f42a7c94b9deb058ccbf5a4a4bbb16346d4d8ade013`
`font_01_sfnt_off0000f42c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF42C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010c43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C43	11056 bytes
SHA-256: `7374f4769b16907e329e0cd30df4920ceabc8118505311b5899d25f21498c3ab`

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