PDF malware analysis — malicious · 37f94ecfaf847bd6

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 18:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: be5486310220efc22fb9692df77d0c78 SHA-1: ad5f9ae06a47892203492b10c583544139103bd8 SHA-256: 37f94ecfaf847bd6ed5c375d8e177987d51c3e36902114afeb15dffa7058db63

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. These links likely serve as a distribution point for phishing or further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=frank+foster+for+life PDF link annotation
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae017d2f3---gezerepiwomivosazub.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a229856dc81---35525439057.pdfIn PDF document text
- http://adaviestransportltd.com/userfiles/file/12344500041.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ae97158276049c7380f77989b78fa12c/18264729756.pdfIn PDF document text
- https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/29a19534e8f82dabde77f8cff196480f/mixumokofudasinonipowor.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ff48b6566da979010fcd5f5fc881f728/43551332993.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077276f00464---90735532142.pdfIn PDF document text
- https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c960921bbb---67867281128.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade3562c2---reboveripawesonejek.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/okcggcva81omf6fnun0dlcarct/xupuxubizipiwiwumaxuso.pdfIn PDF document text
- https://jjcfurnituremaker.com/userfiles/files/76100987689.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f9d78e15---9028816996.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a18aa5170c4---tevugobulabe.pdfIn PDF document text
- https://tahubunting1.com/contents//files/67115658303.pdfIn PDF document text
- http://adirondackseafood.com/ckfinder/userfiles/files/mazasujovufolo.pdfIn PDF document text
- https://giverny-bkk.com/upload/files/sikeweselilifajobav.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d7ae3293---zejawanisiwakox.pdfIn PDF document text
- http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/lagadakexarumajosola.pdfIn PDF document text
- http://gdaniec.com/upload/files/xakofetewapokela.pdfIn PDF document text
- https://getadoc.in/ckfinder/userfiles/files/9663980736.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b36ac73a24239b84d01cd3110afe1a93/muvubidutodomelepawizib.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/9002014794.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abfe7b09b14---jajubenedibagoja.pdfIn PDF document text
- http://cuatudongsaigon.vn/uploads/files/nopidukew.pdfIn PDF document text
- http://www.saito-ken.jp/userdata/file/7851923217.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_off0000f10b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF10B	17284 bytes
SHA-256: `cf06632f66c66836ce5d110fc7b050ab818446edf306034224310faa81f6dd8f`
`font_01_sfnt_off00011e10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E10	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013627.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13627	10276 bytes
SHA-256: `81f484631b539b8f4c2300e475e83b35cc2ed15ec33ecab1bc07f026d30a1ac1`

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