PDF malware analysis — malicious · e4c440def55e1e91

MALICIOUS

PDF

115.5 KB Created: 2021-06-30 00:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 79a453f6174da2254f016022efb78257 SHA-1: ab528e0ad89d556da48095fe5842bf8a1cf668b3 SHA-256: e4c440def55e1e918ec0e2f9593cb5e8ec1ec7d41bca295b7585e0718a44f751

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. No scripts were extracted, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9877

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9b245dac9---paforilowuruderemuvosuwe.pdf In PDF document text
- https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/51c113fe229e3ee0f07db70d091b39d1/jewixonafo.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/af2e11c02b3a8c07b7e614d8ca984a25/jogutu.pdfIn PDF document text
- http://yuhenganquan.com/userfiles/file/20210529110129_1484734160.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/42a7df8b90c92cb3bfa410c0abece6cc/28634314745.pdfIn PDF document text
- http://ukrainski-rosyjski.pl/userfiles/file/15637331381.pdfIn PDF document text
- http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3200cbb71b---lifididigus.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a2c26224c9d1a5cbd2e1f987c4c37a87/lagekejomefun.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b5ecc1494---davugezatozexubifaz.pdfIn PDF document text
- https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1cdb957d2---futubokulalinumeg.pdfIn PDF document text
- https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf84f3f31f---soniboki.pdfIn PDF document text
- http://networkinglikepro.com/ckfinder/userfiles/files/duxutomakosalaj.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/26934575705.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gqgiigugsqsgc772cr95bjhi1t/sekuxifiv.pdfIn PDF document text
- https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7d03c909b201aa10e4af59f2137a037d/zitexeluwexim.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090ccc430bb7---mijotojasuwe.pdfIn PDF document text
- http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac8a02dad9---jiloju.pdfIn PDF document text
- http://hopkinshigh1988.com/clients/75739/File/7328740064.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4c5e089c---romufudovojujesulisaz.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d9e32ddd---6107470989.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f51b4e39c8---97305767270.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a5c16807b87103c3b47693e9f0687cc5/79254419016.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2bdb613cb---5438535809.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210503214851_2101201986.pdfIn PDF document text
- https://abofahed.com/userfiles/file/zixozu.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/672b92d7d5709a8e62b11758afe23da6/90553029056.pdfIn PDF document text
- http://arunimaflavours.com/userfiles/file/5911048110.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=stopping+potential+formulaPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In 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_off00015aff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15AFF	10708 bytes
SHA-256: `7f260fab0d30108f7cef9ec3470b43b8b25d9e997fa1ff936c37476732f0682e`
`font_01_sfnt_off0001739b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1739B	20632 bytes
SHA-256: `193b748abbcb7bddac35bbe63a1fc72d2e3bd0b5b915b9e234fbefe5d9e0d12e`
`font_02_sfnt_off0001a8a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A8A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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