PDF malware analysis — malicious · fa237e60b8b634dd

MALICIOUS

PDF

78.8 KB Created: 2021-07-08 11:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17

MD5: 3f4d33dae40c5bf60824ec918e6fd6b4 SHA-1: 26a2fcaae1900c8b5ea33e79e9221d9d27d9c248 SHA-256: fa237e60b8b634dd72bc04bd038bb687c99baeb54cbc0414df1409691ba290ae

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or SEO manipulation tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://krisoc.ru/uplcv?utm_term=types+of+chemical+reactions+worksheet+writing+formulas+answers PDF link annotation
- http://marcelponjee.nl/ponjeefiles/file/pekuvumobudesiguza.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c8460f33cae3efa9015f5c0e4f5d5b1d/sekomejijujowakudameto.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/fulexuxubanibazu.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcf2d39bd8---56772014022.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094135dc98ed---12546669497.pdfIn PDF document text
- http://alexhoffordphotography.com/temp/files/file/gezoj.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/04d5ceeeadbff2affc78a41be1b669f3/gifomidiwatobadi.pdfIn PDF document text
- http://ttc-investco.com/img/files/ravunutanoxoma.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8e143d42b44d3299edf95bb0c5c4aa12/30552553597.pdfIn PDF document text
- http://younewstoday.com/task/userimages/file/mufupegezufisawolo.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/10047771533.pdfIn PDF document text
- https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210704061628.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2221600f08---64266627077.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b782f1d64fa---54335327521.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ed78cbd6---gawumevozimadigajinezor.pdfIn PDF document text
- http://sy-smile.com/upload/files/63039459967.pdfIn PDF document text
- http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f306918b---84490992142.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd6450600---63476628406.pdfIn PDF document text
- http://pizzeria-millemiglia.de/app/webroot/img/editor/file/76446882595.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pakaw.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af85d9bbd6a---bibonodasanafikop.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9a622f85---sibagovoxum.pdfIn PDF document text
- http://jaatkinson.com/userimages/bemurefabulafemi.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4087197b---rosadatinijumuxeketikera.pdfIn PDF document text
- http://mikomisushiwc.com/uploads/files/bebesefaladolunusuradugom.pdfIn PDF document text
- https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50b78b609a1e051ea0ccc00cffe0e438/dinebamon.pdfIn PDF document text
- http://robwalker.net/fckupload/file/62214748628.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_off0000d224.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD224	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ea36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA36	15788 bytes
SHA-256: `f270373a63deb5bad6db8423f42ad06d03e952cb414273019b55a5c3a5c4e08d`
`font_02_sfnt_off000112b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112B8	11284 bytes
SHA-256: `9bc2b60ada21b6d7d7fe0c172bab02bfaf3fab123c9281d26f6769a72a63af13`

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