PDF malware analysis — malicious · 041f44e9159bb3bb

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 08:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 016946a6099eea7d99ff48df271e2534 SHA-1: 2f830ded305f6e332766db9d81fa18505ad3db45 SHA-256: 041f44e9159bb3bbdb394fe3294d0510849b93f33764e04a2f18e095d6b89746

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS upload storage. The presence of numerous links on disposable or potentially compromised hosting suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://riminabda.sk/userfiles/file/suloxepenival.pdf In PDF document text
- https://paidionresearch.com/userfiles/files/timediwufun.pdfIn PDF document text
- https://foodphotoshop.com/userfiles/files/12168017124.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078791e1b59e---3770009997.pdfIn PDF document text
- http://barudan.hk/UploadFile/file/20210601161624564.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j8rkc091phi6sv7f94legt1de4/41311067718.pdfIn PDF document text
- http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/18927426444.pdfIn PDF document text
- http://tvoirostov.ru/ckfinder/userfiles/files/78738356984.pdfIn PDF document text
- http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad22d5f1bed---36244816037.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a70d5ab5---dizulosatibobaliled.pdfIn PDF document text
- http://georgefamilyreunion.org/clients/86186/File/nonidagikusadepuzejip.pdfIn PDF document text
- http://www.siscbolivia.com/admin/uploaded/fck/file/venuxolikajirevapenomupir.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a6e44338---84241124057.pdfIn PDF document text
- http://nissanotogovap.net/uploads/images/files/naxatexemerex.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v2j2mvuat78jpsaoqa69goaq7t/biripofe.pdfIn PDF document text
- http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3bbedb3eb34ed9fe301fdda913fca982/40763002379.pdfIn PDF document text
- http://agendaalzheimer.org/files/galeria/files/49457203319.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/3ctr7csjh460qjgcrvsimdpiad/63536251820.pdfIn PDF document text
- http://sity-luxe.ru/userfiles/file/dumoralakijedonuk.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664522d87a---98406046726.pdfIn PDF document text
- http://hzjksj.com/images/upload/File/fufipumoxusunejatodo.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786a0289069---jorabinulegukurawuziwoma.pdfIn PDF document text
- http://sevimticaret.net/userfiles/file/fivijitaxivaniroluw.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0a8931a1f3d9e08d129c78f94e453087/tusamurazonitel.pdfIn PDF document text
- https://xn--80aaijzh9b.xn--90ae/documents/file/50152894570.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160798970f2081---vodefudefufex.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=counseling+and+psychotherapy+newer+concepts+in+practice+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_off0000dcef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCEF	11228 bytes
SHA-256: `60190602d684e9137d2ecf0ace1a1f3db818c55c12d2c39124a741337a432828`
`font_01_sfnt_off0000f71e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF71E	16644 bytes
SHA-256: `110d67197451e375fb267de92f37388c89fadfdd04bd9cacfcfdaba2d3df36e6`
`font_02_sfnt_off000121c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121C7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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