PDF malware analysis — malicious · 7dd783ce52b8ba72

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 02:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: d388ab47ebfa285c607efff1e8eca9a6 SHA-1: e7f33489473ed5c543a96de87cdb88cafffd2798 SHA-256: 7dd783ce52b8ba72192840bf75ad7ac9f2d1c9de42e8bf7daee0611e416c73e2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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=2016+fuel+economy+guide+pdf PDF link annotation
- http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/megisokamekitub.pdfIn PDF document text
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/270aum5p5i1m1m0dq8722jgvnr/xufenawedesedaku.pdfIn PDF document text
- http://logtech.cz/foto/Image/file/vimusedesokuwifutukexifo.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/21961052685.pdfIn PDF document text
- http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5tvgfdslov7rpdqac0invve3u3/vuwepe.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ea00de78a823ca3b2d50ca964db32edf/7901102128.pdfIn PDF document text
- https://zzarosiscarampola.it/file/xonewitoluxebomixa.pdfIn PDF document text
- http://ohana1bbq.com/uploads/files/8646432638.pdfIn PDF document text
- https://eucolait.eu/userfiles/files/9978987873.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/larazoposomumal.pdfIn PDF document text
- http://dentish.ru/ckfinder/userfiles/files/wofometiwifolivavebetasi.pdfIn PDF document text
- http://tsg-edinstvo.ru/userfiles/file/65868788898.pdfIn PDF document text
- http://capesociety.ca/uploads/files/332726094.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f985d14828---fekozevukarawejizoneguloj.pdfIn PDF document text
- http://moscowfashion.net/content/xuploadimages/file/pujipafapoweb.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf53172792---62884337596.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0017afa8---jupebolibuxazoluwefap.pdfIn PDF document text
- https://pima-alarms.net/slicice/file/14363441268.pdfIn PDF document text
- http://519pf.com/userfiles/files/wutovi.pdfIn PDF document text
- http://natproperty.com/userfiles/files/kopejapiwituvimi.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/201559faac5d92a4a011b32ffc2f8ef2/wegikixesejoge.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb460d99115---45227067447.pdfIn PDF document text
- https://laptopserwis.com/app/webroot/media/files/pubebalekusizinoboxudeka.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_off0000e052.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE052	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f869.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF869	11012 bytes
SHA-256: `8ad764297765f91afbb37f56d8a0c022994a81e9228f7a0e379e1d623e22b4ee`
`font_02_sfnt_off000111d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111D1	18840 bytes
SHA-256: `3cc960e3dbbb7f8ac37970963973d547881c8f24704f92ca6306049e00948ed8`

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