PDF malware analysis — malicious · 83e6f76b63fe43c3

MALICIOUS

PDF

88.2 KB Created: 2021-08-21 05:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f07fe906e7b3032d56771786865e1aba SHA-1: 8894b01f68f5ec235020fe224798fe7c490df4c4 SHA-256: 83e6f76b63fe43c3e88faafa3f26adfa6ab4e64b68ffe85a6a7e9c46ac23aeb5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose seems to be directing users to external, potentially malicious content through a series of links.

Machine Learning

Nyx PDF Classifier malicious score 0.9877

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
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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7c329f2d5---nebunupo.pdf In PDF document text
- https://arichaindia.com/userfiles/file/66911454667.pdfIn PDF document text
- http://shipagents.nl/uploadfiles/file/53164808590.pdfIn PDF document text
- https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6lhqqqaeu0vju4qc1jg0no27ev/goxiwamudajogiladefo.pdfIn PDF document text
- https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a91eaf15764c92e18407acbf68f6c3a0/favejinisido.pdfIn PDF document text
- https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/pn6ehlpn1dmu7am74evnoeigpd/63052459607.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112909bb10d7---53047257514.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h7ks4kejuo11315hqdcvb1lb07/dukotup.pdfIn PDF document text
- http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/detuluragozejewivodowek.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5cc2ceb9a3d7ee4943d479ed64390266/29945727637.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f3ce59fb05f8f0a7a7f58c4c5da20f58/gekenud.pdfIn PDF document text
- http://aaaexpressheating.com/userfiles/file/24795651187.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9247b45b4---lusukifigekolozajoze.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c5d71588428c39a4a029a829bf943220/4629081105.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e3e10ed47a36d9382514da005503fd63/24484052496.pdfIn PDF document text
- https://faltprasten12.se/anvandarbilder/70/files/xubekux.pdfIn PDF document text
- https://www.antoniopopolizio.it/ckfinder/userfiles/files/nitobopovaparukijumufo.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/viluwugil.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608271c4a76e6---mexurum.pdfIn PDF document text
- https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/63710918a552e03a61721c3084268524/wekudopoxekugo.pdfIn PDF document text
- http://pillshop.ru/uimg/files/xopirefisekemom.pdfIn PDF document text
- http://studioguagnoni.it/userfiles/files/tinofuworemari.pdfIn PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/ea8e95379c03048156b991346eb8c4f5/36584357941.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lt08r6ls8hor66r25arhag5ml2/93618124803.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b668cb6ee7---5943045513.pdfIn PDF document text
- http://ngoinvest.com/uploads/ckfinder/files/nujeviguvimasew.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=concrete+rose+charactersPDF 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_off0000f5f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5F6	16724 bytes
SHA-256: `ac7e3418c156ba47fb2a40dfdb38c95d73e344046e08ad396ae4504cbc48d953`
`font_01_sfnt_off00012140.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12140	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013957.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13957	10220 bytes
SHA-256: `93f15bce14ee65c3620215b785797a29550e61ce43db871d7335650ed4d54253`

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