PDF malware analysis — malicious · b090c7f24c2c0fe2

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 20:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8e4398ab4ee64227c81409c02f0a1102 SHA-1: a342b054768554b8fed93972e97b7c1fbd014be4 SHA-256: b090c7f24c2c0fe2b3a9853c343a8e63fe18157a3c26398fde4bb8176ef117d8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which are either compromised or appear to be disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious sites suggests an intent to lure users to phishing or malware-hosting pages. The document body was unreadable, but the heuristic findings clearly indicate a link farm strategy.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

Heuristics 5

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 http://zzquansu.cn/d/files/jukegejegakixole.pdf In PDF document text
- http://nj-rshb.com/v15/Upload/file/202199159184452.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e71c7d605---wesagopanowabejovopiba.pdfIn PDF document text
- https://ctcitsupport.com/media/files/14779200779.pdfIn PDF document text
- http://nj-rshb.com/v15/Upload/file/202195158214931.pdfIn PDF document text
- http://uralinteh.com/uploads/files/kegisizevebapi.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/254bd47b6306cb89888557bfd8368aea/zogusulakusev.pdfIn PDF document text
- http://wjcopy.com/upload/files/4058189389.pdfIn PDF document text
- http://potentialdesign.cn/userfiles/file/1630699969.pdfIn PDF document text
- http://forepic.com/_UploadFile/Images/file/72423541433.pdfIn PDF document text
- http://wijnhuis-vaessen.nl/site/data/ws/files/moguwefogasigawoxekog.pdfIn PDF document text
- http://allamericannursing.com/userfiles/file/xijabegetivetolarivugata.pdfIn PDF document text
- http://kowalstwwo.pl/public/cms/images/file/witavidixojo.pdfIn PDF document text
- http://ciaomamma.hu/editor_up/62641083683.pdfIn PDF document text
- http://rapabzenec.cz/obrazky/files/14619819647.pdfIn PDF document text
- http://superfasttv.com/uploads/files/81093952101.pdfIn PDF document text
- https://ijaetis.org/ckfinder/userfiles/files/jowufoxuvefivosatavep.pdfIn PDF document text
- http://shceping.com/upFile/photos/2021-9/file/6140204703.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f993d6e95---niluxopulo.pdfIn PDF document text
- http://varadimasszazs.hu/uploads/files/towig.pdfIn PDF document text
- http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fiboxenujuzoteli.pdfIn PDF document text
- http://jamxmpharmatech.com/upload/files/9618493200.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141933c49042---supukiwugolofapuxanini.pdfIn PDF document text
- http://tokyoracing.hu/userfiles/file/fojupawutenolixa.pdfIn PDF document text
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379158d1ef0---ridopuso.pdfIn PDF document text
- http://n-production.com/upload/fckeditor/file/titipisuvaga.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161420e0e01477---wibutakijetupere.pdfIn PDF document text
- http://quartierdete.fr/uploads/fckeditor/file/16407674398.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+convert+mp4+to+mp3+onlinePDF 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_off0000ccea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCEA	10500 bytes
SHA-256: `56dede20ea9196f18d98e24da5c55ab21c7a2f7ab35069316471b3fa2edbb334`
`font_01_sfnt_off0000e4c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4C5	17172 bytes
SHA-256: `652dc8f59f0487f8df49de9ee88a0170eed5a0a166de64bd9ccbdb67c86eca91`
`font_02_sfnt_off00011128.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11128	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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