PDF malware analysis — malicious · af3afb500162c551

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 03:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: e7d188efd9f025ed1b71ce9ba3744509 SHA-1: 9df7166ae8e88740f356bd6036604157006d175b SHA-256: af3afb500162c551972fce703bcd7cca07cbe823c90de9734df8bb5d5e86d5ea

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains an embedded JavaScript stream and a link farm pointing to numerous distinct hosts, many of which appear to be disposable or compromised upload directories. The presence of JavaScript suggests potential for malicious code execution, and the link farm indicates an attempt to redirect users to external malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bc9t6aqict9bgl1o3vq1dang0i/91066604929.pdf In PDF document text
- http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/81803158461.pdfIn PDF document text
- http://solamsys.com/userData/board/file/xumakonaw.pdfIn PDF document text
- http://elard-group.com/ckfinder/userfiles/files/besunodusigazatonedakix.pdfIn PDF document text
- http://abwmountvernon.com/uploads/files/miwazidemivamobaboruvisel.pdfIn PDF document text
- https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/94c709539c0cd5fd5747a691a1b2f26c/rakidexiropakar.pdfIn PDF document text
- https://deesudcoolingtower.com/userfiles/file/2024993322.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614eea4e52dde---4796308257.pdfIn PDF document text
- https://ibliberia.com/ckfinder/userfiles/files/momaxozetadew.pdfIn PDF document text
- http://www.bc-arman.kz/ckfinder/userfiles/files/tunilebaxesonuwateduwa.pdfIn PDF document text
- http://alacarte-grafik.de/userfiles/file/zibozevulesupukosagazor.pdfIn PDF document text
- https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/jimizomujusopamopa.pdfIn PDF document text
- https://glamweddingdesign.com/userfiles/file/6016506657.pdfIn PDF document text
- http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/gefid.pdfIn PDF document text
- http://metamorfozyayincilik.com/userfiles/file/98762184916.pdfIn PDF document text
- http://irina-beha.com/ckfinder/userfiles/files/dewubixopopisud.pdfIn PDF document text
- http://exima.kr/userData/board/file/vupudakimisemajewes.pdfIn PDF document text
- http://thenikharvconsultancy.com/userfiles/file/giwawazudupebonab.pdfIn PDF document text
- https://designsdubaiukfashion.com/userfiles/file/11453870657.pdfIn PDF document text
- http://frutapac.com/ckfinder/userfiles/files/89451305566.pdfIn PDF document text
- http://intproplaw.com/admin/uploads/file/moxibejona.pdfIn PDF document text
- http://baltic-rt.ru/ckfinder/userfiles/files/jotakuzepimive.pdfIn PDF document text
- https://nls.vn/upload/files/13018595741.pdfIn PDF document text
- http://protok.pro/upload/files/5822673814.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=verbs+in+affective+domainPDF 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_off0000b476.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB476	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cc88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC88	15644 bytes
SHA-256: `9d265b23a192e8b15277ff8817a501b660e51ccbfc7181a2a42c0acfcd9ccbaf`
`font_02_sfnt_off0000f460.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF460	10764 bytes
SHA-256: `9a01b848cf67f7568d1aa10617e2e04e0abbf287304ce0c1ef38dcd547c460ce`

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