PDF malware analysis — malicious · aee3eb116c120efb

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 03:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 66d120b47fd36058f9ed6c47413ddfa6 SHA-1: 5da219d769984648c444f238dfee2622dfb4fb9b SHA-256: aee3eb116c120efbd170ce13f51a0372c717d0e74dcc61ae9f0f9a66ab900cb5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. It functions as a link farm, with numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.6659

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
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://ventss.ru/userfiles/files/80568689658.pdf In PDF document text
- https://netron.pt/app/webroot/media/files/39723163254.pdfIn PDF document text
- http://savoie-outils-coupants.com/ckfinder/userfiles/files/72869552411.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614789ac40750---94087371173.pdfIn PDF document text
- https://rocha.pt/userfiles/file/96212367901.pdfIn PDF document text
- http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/gapikidep.pdfIn PDF document text
- http://phanmemerp.vn/attachment/files/sumunebipane.pdfIn PDF document text
- http://crmrealty360degree.in/ci/userfiles/files/kosepewuvoxulunufewes.pdfIn PDF document text
- https://muachungbaohiem.com/uploads/userfiles/file/derazufewapoda.pdfIn PDF document text
- http://bamila.vn/luutru/files/15214147599.pdfIn PDF document text
- http://jpind.pl/userfiles/file/32035080487.pdfIn PDF document text
- http://rowadhr.com/app/webroot/upload/files/64059575065.pdfIn PDF document text
- http://artsar.pl/userfiles/file/24490796042.pdfIn PDF document text
- https://m-astar.com/UserFiles/files/1747461332.pdfIn PDF document text
- https://profession-your-dr.com/uploads/files/202109090849205444.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7b02b90067bcdbcd9fe2e119cb932fb1/duwuvebinusakojitilize.pdfIn PDF document text
- https://olivier-daulte.com/ckfinder/userfiles/files/9804444477.pdfIn PDF document text
- https://ltes.tw-goods.com/UserFiles/files/59163810716.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef0cb3d0b6---78450394124.pdfIn PDF document text
- http://yh-nutri.com/filespath/files/20210918120156.pdfIn PDF document text
- http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/jojotagapelididopuduwos.pdfIn PDF document text
- http://kukubara.com/zdjecia/file/kuxinamolubifopibofuget.pdfIn PDF document text
- http://vinhomescaurao.info/app/webroot/img/files/berivijafitive.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=burst+photos+androidPDF 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_off0000d71e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD71E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ef30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF30	17916 bytes
SHA-256: `06739266d8a7fede00e2d5edfb1c173fe527b9e408431b93b3cf8e0187f42221`
`font_02_sfnt_off00011d86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D86	10464 bytes
SHA-256: `235a2912201a40138cc4569481d73a2433f68908eb18a94905e6a8e3557b3aba`

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