PDF malware analysis — malicious · 917d377ba557a820

MALICIOUS

PDF

88.5 KB Created: 2021-07-13 21:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 67be5952a70f4e7c2ea8194b806c7cbc SHA-1: 9b27076d488ea90bdd5099e24f12a4ab2bb8f9ce SHA-256: 917d377ba557a820e3dcd1fafac52d4f549f128cbb0798cfabbb1a07b544bddb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting files. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 6

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.
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://naucharts.com/ckfinder/userfiles/files/vulasen.pdf In PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd95b2114d1---64796258679.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609818444e449---20073989328.pdfIn PDF document text
- https://vili-al.com/uploads/wysiwyg/files/1804787955.pdfIn PDF document text
- http://noithatdangcap.vn/app/webroot/uploads/files/98012192150.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088160346068---naromawasikobuman.pdfIn PDF document text
- https://mariellatriolo.it/public/file/21323353848.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ab9d0115---52981746241.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2afdeb2a7---nisufiwelukenexuzuketux.pdfIn PDF document text
- http://drivingschool-brno.eu/files/83980440388.pdfIn PDF document text
- http://dahchen.tw/userfiles/files/lujozajujemulujuxud.pdfIn PDF document text
- http://www.evisiontiendaonline.com/ckfinder/userfiles/files/jifenidozakupijuj.pdfIn PDF document text
- https://rh-h1tapi-turbo.com/contents//files/46833649175.pdfIn PDF document text
- http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f1ab105d---81743059494.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/aab2ce19fe60b31540f15e66359af7f6/28704802160.pdfIn PDF document text
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9e005a80c2cd3a6ac76edeaef2eae4ea/25335065827.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/34860701934.pdfIn PDF document text
- https://atl-50.com/files/file/jibekerowexaziwut.pdfIn PDF document text
- https://gymlesgeants.com/upload/editor/file/98188264191.pdfIn PDF document text
- http://taiwanglassgroup.cn/userfiles/file/75920511573.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/48c59c1dc160cb6381f771223d4d3357/xumogavidoni.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608744bcb71be---xudulanaj.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/37776rtcnar26qnbj24ni6igk7/tedosefisezepuwovasu.pdfIn PDF document text
- http://zae.me/datafiles/file/pulub.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=happy+anniversary+sister+in+lawPDF 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_off0000fb04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB04	16368 bytes
SHA-256: `34d0852d566e9b5949d7f4cab0316a7ce57b5101fa020213843f2da3b9e4c49d`
`font_01_sfnt_off0001252b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1252B	10380 bytes
SHA-256: `bdb3b639a1c7a40804532f3e89b4891196fd68a449e9a52a93b330bcbf0f10a8`
`font_02_sfnt_off00013ccc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CCC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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