PDF malware analysis — malicious · ab48ed1be1127b54

MALICIOUS

PDF

90.0 KB Created: 2021-09-01 22:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e0e3d8a0fed7cfdf736e9ceb32e0919a SHA-1: eea1e08f0392645f5c8d2c9d830efd81c97af91c SHA-256: ab48ed1be1127b5464d616a1ed53625b0685fc9113e0d01dbddcb076a0513fe2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9876

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://archism.ru/uplcv?utm_term=infected+angular+cheilitis PDF link annotation
- http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/zuzoxelexesojobosewi.pdfIn PDF document text
- http://roocenter.ru/upload/file/43472363884.pdfIn PDF document text
- http://kimwendelldesign.com/ckfinder/userfiles/files/22243070016.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95776482a0---wowuroxakozibinaxil.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c1a0ce15---pukukowiwedolo.pdfIn PDF document text
- http://olympicburger1988.com/uploads/files/46249828652.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab71d25aa1---makifogined.pdfIn PDF document text
- http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edcc6a0917---gatujum.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16087020342069---8752597361.pdfIn PDF document text
- https://rzfmuhasebe.com/userfiles/file/82292408626.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tafrhe2t9ibo5kq9mul19h7pu4/54537214162.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a6d06b040---weluve.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d896b2f14---98796306511.pdfIn PDF document text
- http://alkanboya.com/files/file///lazafifij.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/92271078225.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c5a4b2892ac3e6858f79d18f07d3b997/valon.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/pezokamufuranas.pdfIn PDF document text
- http://www.eurosecurimed.com/ckfinder/userfiles/files/kexokiduzusomuker.pdfIn PDF document text
- http://apsencollege.org/test/fckeditor/file/wanavub.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3u53ndb5lmpgb33mgvq1o31c5c/dewujutituzu.pdfIn PDF document text
- http://gostinica-domodedovo.ru/files/bofexa.pdfIn PDF document text
- http://kondicionery-krasnogorsk.ru/upload_picture/file/91672279136.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/klc272njkg8epnras32m0n63tp/4737616089.pdfIn PDF document text
- https://bravo-hk.com/userfiles/file/mukolituravoponaxebu.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612559c6b3b33---dasepiruxumafejixawur.pdfIn PDF document text
- https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/694f183c01ae2aa9f20a536090a5f750/94232102286.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_off0000f910.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF910	18348 bytes
SHA-256: `ead0c39af8e4cb1a563745483103aadc64a1314906ed29309d887d1ae61faad4`
`font_01_sfnt_off000128e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000140fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140FE	10684 bytes
SHA-256: `d312b314b9e319544e2e26a0e892c5d6dd7c34032f81fd277dc8368c646dc56e`

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