PDF malware analysis — malicious · 5cae9dce5f949572

MALICIOUS

PDF

71.2 KB Created: 2021-08-30 02:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 731822c8c22863e5c6abba3da34d0fdc SHA-1: fb4f3036ff1c28320715976e3b2ab1066fc022cf SHA-256: 5cae9dce5f94957213135d1246b7cfc1464b9c3c7eea58a97e06ec83fb7045af

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ecccc5d11---91187371056.pdf In PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/303293e59c750502845d620d045cf16c/69735578908.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19172729e---rikirexoganapot.pdfIn PDF document text
- http://paoladebenedetti.eu/userfiles/files/55681123818.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9a53516e---bokoxubasav.pdfIn PDF document text
- http://vytvarnyobchod.cz/UserFiles/File/53112711350.pdfIn PDF document text
- https://educationindiajournal.org/ckfinder/userfiles/files/werukolelimigugagagog.pdfIn PDF document text
- http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/44455455460.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dsugk96u2thi45ls92pnvp1bdi/dozojozelusexevabapajel.pdfIn PDF document text
- http://newcastlehigh1967-50threunion.com/clients/43248/File/53553412473.pdfIn PDF document text
- http://slsnn.ru/content/file/87822575874.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d4710998---68849676460.pdfIn PDF document text
- http://ifaistos.reality.gr/~triantaf/images/file/futurupewavosexo.pdfIn PDF document text
- http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/57711833631.pdfIn PDF document text
- http://jamesandsons.ca/userfiles/file/sigavaxoxobuxukugemaluku.pdfIn PDF document text
- https://mamotato.ro/userfiles/file/xotomavujibadimulateb.pdfIn PDF document text
- http://vitalchurchesinstitute.com/files/file/90118922853.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609840c809f69---bapefudezowa.pdfIn PDF document text
- http://criollo-cocoa.com/userfiles/file/xusibirogele.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe9e50367---69741383450.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=break+statement+in+c+with+examplePDF 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_off0000c040.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC040	17040 bytes
SHA-256: `1d918adb886373e5391848cb06da74f43d8cf3cc56f056cd02e1e1f3bad174a9`
`font_01_sfnt_off0000ec51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC51	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010468.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10468	10852 bytes
SHA-256: `ba74726fe0c715aef1ca7085e722b8be1bc2beadfbba504e99a64686aaff789f`

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