PDF malware analysis — malicious · c7b33cf95f48b184

MALICIOUS

PDF

83.1 KB Created: 2021-05-18 20:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 7e55b1ca656b5798aafc100e0cf227c8 SHA-1: 2c03be804281d01a4bfad6ebf48d8dc2353c5b44 SHA-256: c7b33cf95f48b18409807b961565c22c4d60ad5d3110f05f49ae5e65f2ceb6af

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'stoichiometry practice answer key'. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware dropper campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.8908

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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1ec68c41---51605340364.pdf In PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e92df832---risosevebuna.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094695a9da1b---fukejokuveki.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607359e01dc71---pusitidesixuvaturofesarel.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16098701a59801---wiwup.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df0512c46c---48244996956.pdfIn PDF document text
- https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0d1635d45de8989637931cbffb5f150a/15130977003.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd37fe89eb---gotirovalidoxowivoxo.pdfIn PDF document text
- http://hongshengfish.com/uploadfiles/2021051320191562464.pdfIn PDF document text
- https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1e60c286e9bdaad174d74ba8e698f94a/58285910913.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6093f7ab---kobodijavilozafegudevidak.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdff882c85---11631504016.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/xawafek.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/59502892341.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=stoichiometry+practice+4+answer+keyPDF link annotation
- http://scripts.sil.org/OFLIn 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_off0000fb2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB2A	5588 bytes
SHA-256: `7f710fc93a9ca21f54486c137da82023748959ff04fe9007b92dfeae0b4ada64`
`font_01_sfnt_off00010e21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E21	11948 bytes
SHA-256: `08e61651701c1834c507e3a43ebbffe5c93be0d9f0d37672f5d409dc04b9d783`
`font_02_sfnt_off000136fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136FE	16140 bytes
SHA-256: `5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c`

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