PDF malware analysis — malicious · e693a637d8349a1d

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b96f7bc9486cb22c891cf1e6fd4246da SHA-1: 9a9104baf0877a739cf371c750ad6f8c2f809075 SHA-256: e693a637d8349a1d3152de2d6c380fbf8535f4a287c980f2d51bf9a342af3ca3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://bigbazar.cz/is/images/FCKeditor/File/gidotumugudafadisezumi.pdf In PDF document text
- https://m3nan973ru5-pa571.com/contents/files/38163048794.pdfIn PDF document text
- http://snailgame.ru/upload/files/20210914171445.pdfIn PDF document text
- http://americandeliorder.com/uploads/files/72689362824.pdfIn PDF document text
- http://limeitec.com/upfiles/editor/files/xurididiwujoxusorijodore.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362eb8412f2---kafosabagivid.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p0gro59nfm2oak831mabnt7pm6/rubuja.pdfIn PDF document text
- https://leo.tw/upload/ckeditor/files/ditumadovezax.pdfIn PDF document text
- http://waycreon.net/bhaskar/yii/upload/files/maboxir.pdfIn PDF document text
- http://tuzoltosagmihald.hu/userfiles/file/85737274679.pdfIn PDF document text
- http://alburigiott.it/userfiles/files/84404630268.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130774078d43---maziditigowuwusozowumi.pdfIn PDF document text
- https://bruceleevideos.org/images/file/52694850561.pdfIn PDF document text
- http://m-camper.ru/ckfinder/userfiles/files/gitepukilonufimux.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16152e92ab7bcc---lokelubumozumudi.pdfIn PDF document text
- http://quangcongluc.com/upload/files/16984161106.pdfIn PDF document text
- http://ehomeforeclosure.org/images/file/8971244276.pdfIn PDF document text
- http://imhyuk.com/imhyukeditor/userfile/file/gixivewujozigizi.pdfIn PDF document text
- https://hr-serdahel.hu/images/file/32082737922.pdfIn PDF document text
- http://notar-frings.de/userfiles/file/gepur.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9515f7770ev3k179q8sritl6p7/xasejok.pdfIn PDF document text
- http://atenngo.com/admin/sites/site/documents/11380915359.pdfIn PDF document text
- http://szjglaw.com/uploadfile/file/2021092521195673499.pdfIn PDF document text
- https://hunglivet.com/uploads/files/202109211415017638.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sax+video+player+all+format+apk+proPDF 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_off0000b604.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB604	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ce16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE16	17520 bytes
SHA-256: `5309295511cbf7092381b88937c228a79807cce52a7dcc4bb26c46178fabcb96`
`font_02_sfnt_off0000fb21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB21	10836 bytes
SHA-256: `0865d60407b52eb4f575b15c9df006686eb1789b25625b86007f5a5e6845cb3e`

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