PDF malware analysis — malicious · 1c40c422caee66fb

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 21:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 54e5ce1a310b1f29efea2d17891cbd35 SHA-1: 1fe9b3b03358d7b15ba5c6bdcb3996f8cfc82058 SHA-256: 1c40c422caee66fb30bac5059a60d157fa1b64472f148c6ebb9830e82d5cf41b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure the true malicious destination or to distribute phishing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=honda+eu+3000+inverter+generator+manual PDF link annotation
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/827b6b0603b477988f4c17ad675dbb2b/21107525121.pdfIn PDF document text
- http://topstec.com/d/files/kenojemasam.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e2ceb66c---36357835646.pdfIn PDF document text
- http://midel.me/userfiles/file/57133250526.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c99d81c8a---33025417400.pdfIn PDF document text
- http://teleinwestor.com/userfiles/file/61730186175.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7891df246---sojixe.pdfIn PDF document text
- http://deborahkay.com/ckfinder/userfiles/files/didem.pdfIn PDF document text
- https://inncredel.com/uploads/gijajijowevimeniwuwi.pdfIn PDF document text
- https://ewt.cz/res/file/8465808195.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612612b411790---zobosevubugoxuxifolokul.pdfIn PDF document text
- http://dungcumaymoc.com/Images_upload/files/tuxosomex.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee81d93ca---91900762220.pdfIn PDF document text
- https://eurouniversal.eu/ckfinder/userfiles/files/womojorubiz.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1fd62c9e8---41243430553.pdfIn PDF document text
- http://albertopizzetti.it/userfiles/files/60481167022.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sf57cp3vgfl0v92skm5qflh022/kitubawatavudokumaxuk.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/db0d9107d599383cb5dc04274457beef/ridipilotilinok.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5ab1b560---10714741181.pdfIn PDF document text
- http://gidaero.com/upload/fckeditor/file/banafukeworafuruji.pdfIn PDF document text
- http://labellebeaute.com.hk/ckfinder/userfiles/files/gujoraguvuvoda.pdfIn PDF document text
- http://candemdientu.com/Images_upload/files/35401279288.pdfIn PDF document text
- https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/46588134168.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45d8e5d5e---63724539045.pdfIn PDF document text
- https://southernwashpros.com/nbloom/fckuploads/file/padaroxinu.pdfIn PDF document text
- https://eprobatdz.com/ckfinder/userfiles/files/musefiloxiwoderimanawulal.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_off0000be0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE0D	16896 bytes
SHA-256: `5d8cf88266e498276c6dc843aaf3fd6b78ebfd1a860955218938efc12879515b`
`font_01_sfnt_off0000e9e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9E1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000101f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101F8	10876 bytes
SHA-256: `5acc7054f3dd96708285594c3968f7b849a186d455ad3a0364a4d476c24f1c95`

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