PDF malware analysis — malicious · e5af9943a951d06f

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 05:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 84951f029875a5f5443411869ab0622f SHA-1: 44277388a42e61656b19e9883ab8a8bea23571f0 SHA-256: e5af9943a951d06f9cb5840b382496c2de75101ead4d4498e6312a49b631c76e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs like 'https://irlanc.ru/uplcv?utm_term=biochemistry+study+guide+worksheet' are likely used to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

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 https://irlanc.ru/uplcv?utm_term=biochemistry+study+guide+worksheet PDF link annotation
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6759554f56---17786830745.pdfIn PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1ee80937d7f84a0bedf98a40c3f94868/rufafuboxazapimureniwev.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ut679756cttgtj616950ertbf7/faxeratoba.pdfIn PDF document text
- http://au-zlato.sk/upload/files/madotavojon.pdfIn PDF document text
- http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/j7dbko91iv0a09s9uumuuo6t37/kufowuverepuruzugaxovi.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/vifubeve.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/2ouheab1o8ntv314aihvdkjn8s/musekedufuro.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160865a763fab3---pawanoroxakofi.pdfIn PDF document text
- https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/t8j8v72hopakukbemdeeurcbo5/rikavaxubobexewixij.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/so95db1e8f7pltkppjf226td5t/renididuzewewalafefukevil.pdfIn PDF document text
- http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16105a8e737fb8---mamufaxetare.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e172deb3b---35427514754.pdfIn PDF document text
- https://menlopark.com/wysiwygfiles/file/rekamowapunobo.pdfIn PDF document text
- http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/98298016617.pdfIn PDF document text
- https://babamore.com/upload/ckfinder_temp/files/20210621230507.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/48b6tj18ar500btnf3g96180r3/vulogewagowibeju.pdfIn PDF document text
- http://aqbnb.com/uploadfile/file/xejom.pdfIn PDF document text
- https://eatorhours.org/e-bussiness/fckimages/file/43054299500.pdfIn PDF document text
- http://wohingltd.com/userfiles/83385852063.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7ec06be1---37852865949.pdfIn PDF document text
- http://garderoba.sk/images/_file/82853038268.pdfIn PDF document text
- http://constantemail.com/userfiles/file/1623750457bopepup.pdfIn PDF document text
- https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/783c5786453b645ec2c4c3dba36424af/boposejapewaximasoxut.pdfIn PDF document text
- http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/83496356353.pdfIn PDF document text
- http://kstarsmall.net/userfiles/file///57789174945.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161201c3ced035---pubowinizumasoxilogipajir.pdfIn PDF document text
- 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_off0000ba25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA25	15768 bytes
SHA-256: `e20483a157e3d1b60e69786f8511015d88de8d53dfd807c19e29d8eab37546d0`
`font_01_sfnt_off0000e274.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE274	10952 bytes
SHA-256: `12fc3ee1071b85dbe9cdb2dfcc5d9bf14657401ec1302bf541510811c06a2a7d`
`font_02_sfnt_off0000fbc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBC9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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