PDF malware analysis — malicious · 77ded86ebe3b2366

MALICIOUS

PDF

89.7 KB Created: 2021-07-06 20:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 3dd37d1f88fe791dd8b6fc50ea114a6b SHA-1: 5e6c033a8313d3c9e91eed5afa3e07d31f7c0670 SHA-256: 77ded86ebe3b23664439bb0318a7e7933e6537351e1691ea386a67c1fd776856

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4310d0c97---66752499637.pdf In PDF document text
- http://davidhammerstein.org/userfiles/file/25408413649.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/56400616524.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/04f2f2f002649bfd6f51c419dc64f1bd/xefifitiropadedujidozul.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb9db93d27---91250570172.pdfIn PDF document text
- https://comobrew.com/newsite/images/user_uploads/file/20374800583.pdfIn PDF document text
- http://st03.it/userfiles/files/vugakozusixufosonil.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/4b838cda9ab5f34a7c8a7db27cfab054/suzodogoxifekirixez.pdfIn PDF document text
- https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/5snumr1aqorg517vscfb929bcd/21951659724.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5af4c024---mufigu.pdfIn PDF document text
- http://lumieretvie.com/userfiles/file/79338185053.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66bfda294---gikog.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0to202d4v0sjl7t1f8t4429ufo/pogavab.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1v44trld6stvimn3mn42vhbp03/90487925011.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0e9390a8---61386817676.pdfIn PDF document text
- http://apcmagon.com/userfiles/96285105872.pdfIn PDF document text
- http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/64309287089.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b303faa101c---89277728014.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1f72e60c---7388745530.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160848832efb9c---3665992397.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bda12dcb11b---loralutifofejetotubop.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/bajodonafewezepuzupumid.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160948109a5bc3---15396785595.pdfIn PDF document text
- http://flagrant-desir.com/userfiles/file/8177214084.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982ab605603---mogesusuk.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608610a2b57f7---75781316705.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/dbf08308719c7308c024be10ce966305/31630657391.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hollywood+movies+2021PDF 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_off0000fc4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC4B	10496 bytes
SHA-256: `b4d7caf4bc25301663042ce679368aeeb0924decffde0c69fd26aa200e840cb7`
`font_01_sfnt_off0001143e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1143E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012c50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C50	17336 bytes
SHA-256: `c935c731d52246ba60f2b66949ec052c4db10a2851817482d22da6424703d9e9`

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