PDF malware analysis — malicious · cb5fbb636bc978d3

MALICIOUS

PDF

91.5 KB Created: 2021-09-03 21:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: d962e3db5ba4584a3f3daf04ded8ef17 SHA-1: f208fb4c345eb9350be4fd1a2c51a547f3c3f22b SHA-256: cb5fbb636bc978d35cd334b17004e99d0e42f5351bc9bf1851b73cc4ad57b228

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 a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious external content, likely for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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=your+pregnancy+week+by+week+pdf+free+download PDF link annotation
- http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/27873327931.pdfIn PDF document text
- https://samarpanbharat.org/trila/userfiles/file/situzinulixowefigo.pdfIn PDF document text
- https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cff2fd4bd1c677c406e7f3d56bd062e3/39959217506.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086807416e05---22595095365.pdfIn PDF document text
- https://veaodaibrahma.com/uploads/image/files/moxapivutikapuzomukaxuju.pdfIn PDF document text
- http://texmet.pl/userimages/file/xarid.pdfIn PDF document text
- http://asiavent.com/UserFiles/file///jubif.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/ratewapawepufafegojupep.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa80083a9d---36014788747.pdfIn PDF document text
- http://projecthouse.bg/uploads/CKfinder/files/6624885055.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8hm63m62utnjriin5pljcgsvbn/80891379757.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/12e07c5990ad3fa047f1602d3d58ecf4/tawimedinitun.pdfIn PDF document text
- https://aurorabersinar2.com/contents/files/11063674349.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0184730d---50613201422.pdfIn PDF document text
- http://dansensvenner.dk/imagesfile///kixapekuxi.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e74bd37668---32222176273.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f3f7d9601---pasowixogipu.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/336d8c71cd93b39b76b98026d7f61352/guxekipakufijinisenera.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d05fe65f656---39860269517.pdfIn PDF document text
- http://maility.pl/_ADRESuserfiles/file/pusutorudifepuposa.pdfIn PDF document text
- http://hoangminhphatkorea.com/webroot/img/files/zuwedolizux.pdfIn PDF document text
- https://amadesafar.ir/basefile/amadesafarir/files/xulexiropijakunufu.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976b4588d0c---dagunepowubegapede.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/58619404051.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/08ca6462021d9397207ab02c1b011efd/84214075261.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e1a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f9b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9B9	18260 bytes
SHA-256: `f9d4d8002bb13e1e6fa1127db3af58eb4fb51440fea935d9b8a16071a95e773d`
`font_02_sfnt_off000116ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116AD	10952 bytes
SHA-256: `c2523f63ceecc41b711500d05ec84f3f626a63d3dac2973fca813be319ed852d`
`font_03_sfnt_off00012fcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FCB	17936 bytes
SHA-256: `0160fa7163df3cc63190e509d7efb81194aaca1be5e31b3dd76403c76419163b`

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