PDF malware analysis — malicious · 5b610c4241bd2876

MALICIOUS

PDF

75.2 KB Created: 2021-08-27 22:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 6a1043de83cc59cc72ead64eafcf8f6e SHA-1: b67db84f5129bbe062c33d4e9f169aca99a10878 SHA-256: 5b610c4241bd2876fca998089adbed6eefd288fac9101b4202317009994c3ace

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites or phishing pages. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=erotic+comedy+hollywood+movies PDF link annotation
- http://achilleferolla.it/userfiles/files/mebobogupivulot.pdfIn PDF document text
- https://alixdemassy.fr/userfiles/file/nazomine.pdfIn PDF document text
- https://gifarlcm.com/upfiles/editor/files/96815252806.pdfIn PDF document text
- https://mysmartedu.com/uploadimages/files/1427697590.pdfIn PDF document text
- http://mijn-nederland.nl/userfiles/file/gifegoreputolejopikolase.pdfIn PDF document text
- http://www.niziointerior.pl/upload/file/30974536370.pdfIn PDF document text
- http://mtsskzy.com/userfiles/file/porogapitefupazuxaviviwo.pdfIn PDF document text
- https://uleshuzatabc.hu/files/file/5404877009.pdfIn PDF document text
- https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/968151c6960ab5dc4cd1b4211e3f85e2/77507488546.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f51d22452---1845897639.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/om492hgh35d2sefc2cf1ffjeq1/99908697198.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b2a2121b---karupa.pdfIn PDF document text
- http://atut-biuro.com/uploaded/file/57970238713.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca3c20dc6---pasojopodur.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4fb0fb3e---mefebipemolonug.pdfIn PDF document text
- https://samarpanbharat.org/trila/userfiles/file/55163164171.pdfIn PDF document text
- http://kleinschaden.expert/userfiles/file/50712917250.pdfIn PDF document text
- https://dintek.eu/uploads/file/ruxafariluzolopubogubisi.pdfIn PDF document text
- https://akemi.ro/hirek/file/40988110316.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9993vcuj19g0q03gfrpce7lqmt/80638994028.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e338e94b8167eb503cba860cd184863d/93001038873.pdfIn PDF document text
- http://yokohama-model.com/userfiles/files/zanirunomiziziwigopisovav.pdfIn PDF document text
- http://medica-eg.com/userfiles/file/suzagaxemok.pdfIn PDF document text
- https://nabijdefossa.nl/upload/files/30233167364.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_off0000c404.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC404	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC1B	10616 bytes
SHA-256: `9ef61bf04eeaaf9f2335d790f81be5c5ac16e815141672f9de818606c6466a31`
`font_02_sfnt_off0000f46d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF46D	16392 bytes
SHA-256: `186ddf6c79a590c8b2629f80533873038f218f4e546c59afb880f21c8cdc95fd`

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