PDF malware analysis — malicious · 3e1a2537b622c457

MALICIOUS

PDF

73.6 KB Created: 2021-06-17 21:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 554c2f79a8b806523f2305ad0c3959dd SHA-1: 4bf594f1670a64af5178d144e6daf9ae0e1d9c95 SHA-256: 3e1a2537b622c4577e4461bc09bbbd86d410cc7547a4409fa18b6090693cdf46

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on disposable domains, with one URL specifically mentioning 'sound of silence mp3 download' as a lure. Heuristics indicate the PDF is designed to host a link farm on compromised CMS upload storage and disposable hosting. ClamAV and ML classifiers confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9931

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://jl-vacuum.com/upload/files/pekoxobose.pdf In PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a581cde6b3b---dubuvolebewilavuj.pdfIn PDF document text
- http://446888.top/userfiles/file/67779680191.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfdde94965---50598864344.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609282ff8df27---lopovoberubikepep.pdfIn PDF document text
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/95e8b7b21aea392146f13bd8f25593ba/kinogekigumitup.pdfIn PDF document text
- http://novussiteyonetimi.com/uploads/file/kuwamukir.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d0a1f277---29596723461.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b203c75ab22---8541647090.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43cbe6628a---zatajusuzivazutotidupor.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e405cfbfdd235354d4f02fc28485631d/kuparasikitenuta.pdfIn PDF document text
- http://meble-tk.pl/userfiles/file/38118446556.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094684aca19a---6889348698.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7f75d97f564e8f5b6e9a7f73bc72512f/jazeme.pdfIn PDF document text
- https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/7c1ac6ae0721f1c083bdfddec0c12431/87177341811.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/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sound+of+silence+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b9b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9B2	4060 bytes
SHA-256: `1cfb3976f48067230ba6370598a71bfba077306841ba29efe9d906289d49c815`
`font_01_sfnt_off0000c7f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7F5	5564 bytes
SHA-256: `ec4827d4a24164ebd5e717f43ffc37dacbcedd53325492c78dab21324f317afe`
`font_02_sfnt_off0000daed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAED	16348 bytes
SHA-256: `6ff5c4019ac06019f5f0b7ef4efaa79ff24fcfeabbe475e0ea7e26db2770ca05`
`font_03_sfnt_off00010523.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10523	18776 bytes
SHA-256: `1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6`

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