PDF malware analysis — malicious · 21dd94a04921fdc8

MALICIOUS

PDF

95.6 KB Created: 2021-09-04 06:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2e281f517e2b1f4882b623b8b741c454 SHA-1: df80077a5150b21aafde40f340a56eccfbab32cc SHA-256: 21dd94a04921fdc84c47a45b9acbd7f271a9127e590e77d04b717bc45e29229e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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 https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/66b7b73f296a3669c97233d16a3f02bf/fitadiwijulugarusowidu.pdf In PDF document text
- http://www.biotanika.pl/upload/file/zavovakolokarafu.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49e2e7710a---90158609926.pdfIn PDF document text
- http://broorybulldogs.com/clients/33993/File/nebazako.pdfIn PDF document text
- http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/26379717308.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4d558d7367c72fcf57dfe917930da856/25371815528.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e0d92ea77---2666762732.pdfIn PDF document text
- https://bitree.com/ckfinder/userfiles/files/39399859838.pdfIn PDF document text
- http://buyyoutubecomments.com/ci/userfiles/files/29294593820.pdfIn PDF document text
- https://soalmatematik.com/userfiles/file/8014020135.pdfIn PDF document text
- https://mkycc4.com/kycc4.com/userfiles/files/95624506309.pdfIn PDF document text
- http://biosurfest.com/userfiles/files/jinuzisusifu.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///godexilurabirilomekuxox.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/72f76be0f6214697c4b96355639a86ed/raxewixe.pdfIn PDF document text
- https://braindevelopmentmaps.org/userfiles/files/14124144609.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e46bcc2e6---29439654647.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d76bbfae746---nalefibekasutefu.pdfIn PDF document text
- https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160863c48bc97a---7934922240.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1bd4ca8099b2d2db8426fff35bd3c7d3/rotozamajolozudigu.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b9165b6323ef2e755902483bf8518416/lixovavadajenev.pdfIn PDF document text
- https://viboot.com/ckfinder/userfiles/files/kufexaxiwafalolu.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608519117308f---14081630255.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815690e5531---17848942163.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3a6afa07---jupujodirowesalitefir.pdfIn PDF document text
- http://trungtinjsc.vn/upload/FCK/file/77101046811.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=leadership+styles+and+organizational+performance+pdfPDF 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_off00010bf0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BF0	19416 bytes
SHA-256: `9d245ff6046d8b4caa0b3df4f1db521cf09f0079b79d0aa841d33e4a364d3320`
`font_01_sfnt_off00013e76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E76	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001568d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1568D	11196 bytes
SHA-256: `95e632aecba7383619be5a5420d6c81bc1cb5121874bac467027617ae774bbf0`

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