PDF malware analysis — malicious · 89d1554d4e82c03c

MALICIOUS

PDF

85.1 KB Created: 2021-07-13 21:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 04305e6971810562af75d0cd1f4466c2 SHA-1: 0326bb9ef91ec7309674fdabad2baa23fa23f3df SHA-256: 89d1554d4e82c03c8e5b1dcef602ec8f90d98fb0a397fd37a0ad6a6a8824ae46

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the heuristic firings suggest the PDF's primary function is to act as a link farm, directing users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=good+adjectives+from+m PDF link annotation
- http://luingpyrex.cz/foto/Image/file/lajosowono.pdfIn PDF document text
- http://viewcs.com/partner/upload/dextfile/30832191122.pdfIn PDF document text
- https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/kmgg79hu1rms2qvig2997jtjmb/gexexakaminet.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab09b90753c---98141760128.pdfIn PDF document text
- https://educhina.mn/editor/files/labuxirorakamavegunujoti.pdfIn PDF document text
- http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5kt4re6gla4u2e5i6g1d7g1eh4/dipudoxepi.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160925fb026433---72799547372.pdfIn PDF document text
- http://stpatricksreunion.org/clients/84553/File/xajegubuzof.pdfIn PDF document text
- http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/6lcupq332np5c74ijao17gjpe8/sirevexugituv.pdfIn PDF document text
- http://hzdshg.com/images/upload/File/70421085170.pdfIn PDF document text
- https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/t9sbqet3d72tevoruog30i40dk/94747772217.pdfIn PDF document text
- http://apexibd.com/uploads/fck_uploads/file/webil.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7a008d018ec808a4e4b48dcf57cf78e0/jatotokowara.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7f6e66ce---18537244713.pdfIn PDF document text
- https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/02qa03rcvklnoqvcbdo0esu1n7/pixarenar.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c1fc982c4---kukokebodij.pdfIn PDF document text
- http://s8radziejowice-paszkow.pl/userfiles/file/jisetadufemexeg.pdfIn PDF document text
- http://hncastlecable.com/d/files/pomojiruvomelowixavode.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dfc375a5c---15231750205.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e3909972---kutijilowosegawivuzu.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/79553d74278cbca80388f3dd6cebacfd/jiwikejejuposisifowiw.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1nl8r46rpmjpemhsbggbtf0i82/dutuwizifumexozunuvasenug.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084769d9ee51---92631516215.pdfIn PDF document text
- http://www.dereformasenalicante.com/archivos/files/joratiguzunexaxaxule.pdfIn PDF document text
- http://watdoenwevandaag.nl/upload/gogekipaj.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_off0000ecaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECAF	10724 bytes
SHA-256: `9dd7e307e45c3962c7078517af0b073ee8d3d0b937f49c13734f4ca6ded18432`
`font_01_sfnt_off0001055b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1055B	16260 bytes
SHA-256: `98939db6c86f0fbb37ab330d26aea3493bbb3ec529ca933f9280ed3a9cc96f16`
`font_02_sfnt_off00012f52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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