PDF malware analysis — malicious · 839f11c2c9b19494

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 08:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 714435d7dfe3bef92d27ea7562988670 SHA-1: b6b233304af0145fc4af405382ca19a469070d9d SHA-256: 839f11c2c9b19494f184a52a75d5a378f97038a1363fef62a8b03140d1f5d081

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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 http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t1tgarhkgl0oc8rd47kk6q1rj9/napukesepo.pdf In PDF document text
- https://advantagelic.com/singhania/downloads/file/sisuselobeze.pdfIn PDF document text
- https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/fp19tkkm77b5ocm4093mkc40pe/domariwunijaniwuri.pdfIn PDF document text
- https://bnbcostaverde.it/userfiles/file/turovawe.pdfIn PDF document text
- http://moscowfashion.net/content/xuploadimages/file/vusotowetekekel.pdfIn PDF document text
- https://capitalsyndic.com/userfiles/file/43370521982.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c3ac49305a87ff59fca7bf5d13f2447b/donivavekimabakol.pdfIn PDF document text
- https://tootooair.com/FileData/ckfinder/files/20210722_70F2AB5ECA7BD10F.pdfIn PDF document text
- http://brno-skoleniridicu.cz/ckfinder/userfiles/files/74468981135.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/724b3ce942ffca6ee2db2bf3a43fcaa4/migakudimilivunege.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf30a874e84---29443742272.pdfIn PDF document text
- http://mastera-mix.ru/ckfinder/userfiles/files/forexejara.pdfIn PDF document text
- https://chornakorn-packing.com/ckfinder/userfiles/files/revilezejowasunajedaj.pdfIn PDF document text
- http://tasteofruraleurope.eu/upload/File/nofadufenirepi.pdfIn PDF document text
- http://galeriejacqueselbaz.com/userfiles/file/lasifiseviritegudumanek.pdfIn PDF document text
- https://taechoclub.com/FileData/ckfinder/files/20210819_8D9D92DBBC488440.pdfIn PDF document text
- https://loyallcanada.ca/editor_files/file/xetaza.pdfIn PDF document text
- http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/vogitodizatonorifozafubob.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a6f215c836bb147433b3fe9599901677/33369111127.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/09ad439b9be20dcf6716155149e13639/wixituzumupegewiw.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f466471416---tijijujudepi.pdfIn PDF document text
- http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210712092723.pdfIn PDF document text
- https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de275f04a59acb9276ca2f96f508c6de/kanuz.pdfIn PDF document text
- http://asfcursillo.com/clients/879797/File/55517086622.pdfIn PDF document text
- http://kamkmori.cz/ckfinder/userfiles/files/waxoxunuvelulij.pdfIn PDF document text
- https://thaiahpa.com/flash/files/naxakapikafulewido.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cardiopulmonary+resuscitation+pdfPDF link annotation
- 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_off0000e394.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE394	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fba6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBA6	16416 bytes
SHA-256: `708d8d0dba3945698e0e4511b399aef5b4aa5a666dd334284c4aab361d141f9b`
`font_02_sfnt_off00012629.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12629	11024 bytes
SHA-256: `aa85eb9171bcb5699f71c2d184d4527859dd7362563c8fe4d16cdec576cdb69e`

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