PDF malware analysis — malicious · f0413f1ac2f02a79

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 05:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 57ee04ad500e3d8b90b0e7eab2713ef9 SHA-1: f5a9e2096695ce9654f4cc3c9459921b822cae05 SHA-256: f0413f1ac2f02a799a0f28856523d592a6ce04777c55bd8ebfc5edc534124994

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

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 http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96bebeedd---78056530086.pdf In PDF document text
- http://praguynakorn.com/praguynakorn/picture/datapro/files/rugafasom.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624095c220---noxakelovanikadelejomaja.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2117b77f074bb335061b66cba952d71d/84419064630.pdfIn PDF document text
- https://aletihad-group.com/userfiles/files/48549531752.pdfIn PDF document text
- http://www.kevimotor-rock.hu/files/files/belikamejazofa.pdfIn PDF document text
- https://pellevah.com/upload/files/83750220106.pdfIn PDF document text
- http://happyorderfood.com/uploads/files/xijodiraputufowisod.pdfIn PDF document text
- http://boxethai38.com/upload/file/fovodapaxujusidekesute.pdfIn PDF document text
- http://haithuanphat.com/uploads/files/49474670878.pdfIn PDF document text
- https://capital-publishing.com/ckfinder/userfiles/files/fefinisanotido.pdfIn PDF document text
- https://gtnet-engine.com/ckfinder/userfiles/files/vavudimesulobob.pdfIn PDF document text
- http://constantemail.com/userfiles/file/1631472936bavebarazitevirugo.pdfIn PDF document text
- https://mepho.hu/ckfinder/userfiles/files/pijixupusujefibonidizali.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613944766942a---45598774146.pdfIn PDF document text
- http://teresachild.com/upload/files/gazededalunojeleza.pdfIn PDF document text
- https://pima-alarms.eu/slicice/file/rilozofalusejosoxilazikak.pdfIn PDF document text
- http://hosungtour.net/FileData/ckfinder/files/20210903_59D6244F9D697106.pdfIn PDF document text
- https://egokituz.eus/files/galeria/files/regiwamat.pdfIn PDF document text
- http://hbisan.com/userfiles/file/92271108788.pdfIn PDF document text
- http://zbirozskepodzamci.cz/userfiles/68370645077.pdfIn PDF document text
- http://sictombbi.fr/ckfinder/userfiles/files/38262812307.pdfIn PDF document text
- https://premium-house.uz/images/file/13208746381.pdfIn PDF document text
- http://busangh.com/attfile/fckimg/file///202109025852_967840961.pdfIn PDF document text
- http://reafamily.lt/ckfinder/userfiles/files/25575367972.pdfIn PDF document text
- http://goozzl.com/userfiles/files/45285283007.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=spiderman+far+from+home+yts+torrent+magnetPDF 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_off0000c00e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC00E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d825.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD825	11088 bytes
SHA-256: `7a8d5bcb3e0eb33e34c36b8800e7ef66d022341245f34d66aa1406a0f9ec137a`
`font_02_sfnt_off0000f195.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF195	18060 bytes
SHA-256: `fa4e48b1d3efc134e1857fee58efcf76dca978fbb72fbc7c4e6822b312d27b01`

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