PDF malware analysis — malicious · f52381b39913057c

MALICIOUS

PDF

90.4 KB Created: 2021-06-28 01:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: d8cd7f2247e5391ce2525270dc86fe9a SHA-1: 0ec5feae5ddc5f3b2f6ae6cb6d923ce9758d0efc SHA-256: f52381b39913057c6fec9fa32f25c0fdee094bc76f86059106959c9942249396

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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, potentially exploiting vulnerabilities within the PDF reader.

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://philabc.ru/uplcv?utm_term=most+earning+jobs+in+world PDF link annotation
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d40b44bb67---55251177850.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8c493702---98052815976.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb892e4fa2---52424495045.pdfIn PDF document text
- https://mariellatriolo.it/public/file/gosatijixuwevozobisukaten.pdfIn PDF document text
- http://americanpetrochemicals.com/customers/CMS-IMAGES/file/befivuvafoxobebi.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb307f901d7---rixezenex.pdfIn PDF document text
- http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c684c7bc351---fetenupezodapivirenu.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/pohocec4211pfstn7qhb1ere37/96283047621.pdfIn PDF document text
- http://smn68.com/clients/75339/File/52126001993.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6sqd1ivka5to7mlbipluko4m3l/95518542063.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbc37831f7---dovakodaragamudabim.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5cffafe52---wiwazumefugafuzo.pdfIn PDF document text
- http://andrelandberg.com/userfiles/file/96826259460.pdfIn PDF document text
- http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/koxobenologivuwoninef.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mt90kcouq7le9j031frpculemi/nejubutogazokegaravomez.pdfIn PDF document text
- https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/da7a571976ca1c6f602ed79f2430e1ab/loledasugalalu.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca54e3e9bb---9965961004.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d6e3e0e15d21d992281e666d584d4cb/15163470629.pdfIn PDF document text
- http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5b04112aff963056301148701abfb0e3/gonazadojunaxoku.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607602dc5b966---48934823845.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073206e5d33f---20386908612.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16083834b089f0---fepenuxafera.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/867de329dad8ea625dc0192448e8b334/63343804479.pdfIn PDF document text
- http://hysansam.com/fckeditor/userfiles/image/vibalitimejexawedi.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608669ce0af27---sawomejikupax.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_off0000fa1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA1C	10772 bytes
SHA-256: `885548cac39c3150dc32744d92f953b11c4b4b3b250e8387decaca817c6abddf`
`font_01_sfnt_off000112da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112DA	18104 bytes
SHA-256: `75e7fd12c113ab8762c8440693c857fad3705417f7b2f38af2621a0c4b08f3a2`
`font_02_sfnt_off000142e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142E8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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