PDF malware analysis — malicious · 2039c37d0837fdbd

MALICIOUS

PDF

81.7 KB Created: 2021-07-01 09:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 0cf5e6a6a24003536fd28a6d48c67f61 SHA-1: 5ec54e3f0ac6b602fa617bc3edea23b5907f769d SHA-256: 2039c37d0837fdbdd0cf5e60771e890389d68b985583e46ebe7b0b940c0187f4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many distinct hosts, suggesting it's designed to redirect users to potentially malicious sites. The presence of compromised CMS upload links further supports this, indicating a pattern of hosting malicious content on compromised infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://hkt-optics.com/hkt/images/userfiles/file/43700481465.pdf In PDF document text
- https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2f484a7358300d3dc59ec47bad6c677/63050015940.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a4887bf20---duxafatoludotororimujax.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d66d5b60---zejuguberobomuvafezufij.pdfIn PDF document text
- https://ystechpro.com/nbloom/fckuploads/file/8235345918.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b19f3ee01---90576267439.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096593c9afd4---ketezoxazosisaredomupu.pdfIn PDF document text
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b6f8969fffb40a24c03b4b8f097d28d3/52297493364.pdfIn PDF document text
- http://derkwoo.com/upload/editor/files/jodoja.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4mi3t43ib0n45n77a2i81bj4c0/ziseme.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17ef08e83---noduvuzuxezagunav.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608848d0d6e4d---91014430218.pdfIn PDF document text
- http://symbioticlifetech.org/attfile/fckimg/file///2021051719378_305831723.pdfIn PDF document text
- https://micro-churches.net/uploads/file/74045370883.pdfIn PDF document text
- http://allaboutdowney.com/userimages/nipikobawarunexurejuxiwuv.pdfIn PDF document text
- http://techbis.pl/files/file/sexikodu.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf4407ee75---25697707634.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lge3kej8avloiu2jdslaolpers/38381602078.pdfIn PDF document text
- https://casabresciani.it/uploads/file/96842373445.pdfIn PDF document text
- https://prokoncept.hu/admin/blogfck/image/file/20782071722.pdfIn PDF document text
- http://studiolauramoschini.it/userfiles/files/68280320229.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc89a4fdb---1465329604.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6633bdc66e---kureritetasotagivipaxizit.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607167419c4c7---jibizak.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/29d65c4a91cb94b86e124a2d527ff482/gapanituseziwi.pdfIn PDF document text
- http://ptaki.info/imgekoprojekty/files/42990310486.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=night+and+day+woolfPDF 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_off0000dc40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC40	17096 bytes
SHA-256: `52a690452eaf572030bf42134592faa97399dc3ab3d3ef5808a9e9ce3ebe4604`
`font_01_sfnt_off000108ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108ED	10408 bytes
SHA-256: `f29b8e952ee02e57599af7cfa9199310d399fa0af2ae47796acc3313d82466c3`
`font_02_sfnt_off00012038.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12038	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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