PDF malware analysis — malicious · 8c912e71f518fe9d

MALICIOUS

PDF

77.9 KB Created: 2021-10-08 19:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 9a1b2621badf718e608d241fe36042b9 SHA-1: b87bec0e5856b3cde98b7bf3dd48f0e56c06198d SHA-256: 8c912e71f518fe9de21690efd1c1b19028797df542dcfc5f792d46a9ec6b5c14

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URIs, including links to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.6760

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://dralituncer.net/userfiles/file/27351183354.pdf In PDF document text
- https://aalatour.com/basefile/b2caalatourcom/files/vedesebibexaleja.pdfIn PDF document text
- http://abwingsva.com/uploads/files/98781461771.pdfIn PDF document text
- https://sokole-tps.pl/userfiles/file/10005633430.pdfIn PDF document text
- https://satbietthu.com/luutru/files/38132152519.pdfIn PDF document text
- http://caycanh.vn/images/fck/file/78046480742.pdfIn PDF document text
- https://073741256.com/uploads/files/202109280847376097.pdfIn PDF document text
- https://playerpress.com/ckfinder/userfiles/files/89108598079.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614884ab9af06---taboxexoribasaw.pdfIn PDF document text
- http://snnet.kr/board_pds/fckeditor/2021/09/file/73631042482.pdfIn PDF document text
- https://projetounificado.com/uploads/files/19916805934.pdfIn PDF document text
- http://jiin-torng.com/uploadfiles/20210924010249.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161569c1bd6949---zusosoxavululujeri.pdfIn PDF document text
- https://ixiu-23.com/uploads/files/202109060153167142.pdfIn PDF document text
- http://esipro.lu/userfiles/file/81225907353.pdfIn PDF document text
- https://abzesolar.com/uploads/files/93586224035.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3461edf204cbd030908bdce4a6a8dd29/19892962546.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153bdca5c603---gaxedawuvafolo.pdfIn PDF document text
- https://eurosan.pl/user_images/file/46744543606.pdfIn PDF document text
- https://pernambucoimortal.com/imagens/files/jujurapew.pdfIn PDF document text
- http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/razedexagawazokawinago.pdfIn PDF document text
- https://araprinter.com/ckfinder/userfiles/files/xisugekufesupixigekok.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+new+world+order+ralph+epperson+read+onlinePDF link annotation
- 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_off0000d557.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD557	18368 bytes
SHA-256: `6918b325db784ddc590601d61f85e22c99ed2d56972670ede125fa55fdc65804`
`font_01_sfnt_off0001052c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1052C	10440 bytes
SHA-256: `6cb12b458fcafde2d6189d66c75d4df9d899faa9362f71e3ed6ae32042e67454`
`font_02_sfnt_off00011ccc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CCC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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