PDF malware analysis — malicious · ae144f5a825bae49

MALICIOUS

PDF

78.1 KB Created: 2021-08-04 19:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 189679e2c67b6795fcac604ec022bf61 SHA-1: 28883394e6934d51e30051f29e84d1f895765c11 SHA-256: ae144f5a825bae49e5788c64c3750df71551258fae2545b90cf19d9269f21508

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that host further malicious content. The presence of multiple compromised CMS upload links suggests a distribution network for phishing or malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/874ffd200ebb74721760c172200ee430/doborukexutibesepumikaf.pdf In PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c987a066c28---81065216512.pdfIn PDF document text
- http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/8669768168.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caebfec0fb---ruledimosoxakol.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/99fc681e9f10fce133391779365d71d5/tuwiwojat.pdfIn PDF document text
- https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/5e114819efc7704be1ebf8a2a16851a4/94648666357.pdfIn PDF document text
- http://cupta.org/userfiles/files/20210714102913.pdfIn PDF document text
- https://cargobull.cz/res/file/10824219353.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc87655fe0---wilowaxibitovisedopam.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160767d008ea64---17273768022.pdfIn PDF document text
- http://muslimofwestbengal.com/mwb/editor_upload/files/86247597266.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa539479f24---52862045709.pdfIn PDF document text
- http://www.adarshvidhyasankul.org/userfilesfile/danafozebiripewavit.pdfIn PDF document text
- http://hanboo.cn/Uploads/file/2021070913573570554.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160be157877d73---63518078211.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb537af1c7---sukirazuguranuramipiwo.pdfIn PDF document text
- http://vaness-sens.fr/ckfinder/userfiles/files/davasefagijowoz.pdfIn PDF document text
- https://energooptima.hu/upload/File/26550888299.pdfIn PDF document text
- http://ahdongjiu.com/upload_fck/file/2021-7-24/20210724043431445330.pdfIn PDF document text
- http://saharun.org/uploads/ckfinder/userfiles/files/xegoboxi.pdfIn PDF document text
- http://omatsuri.kr/data/userfiles/files/pojolefafizul.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ad8070a---92697185738.pdfIn PDF document text
- http://worthingtonpark101.com/userimages/moxev.pdfIn PDF document text
- https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/58eaf6e29f79af72e31661c2d85c4051/21569193095.pdfIn PDF document text
- https://tectrongim.com/uploads/files/59796180774.pdfIn PDF document text
- https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e96a4d790f2dd7598fe5294cba1bff48/95523759306.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=leaf+structure+and+function+worksheet+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_off0000ccef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCEF	16052 bytes
SHA-256: `b2a0d22892066a43812224133ea53ee4d049d5197979343d5bf3e8ca7b091535`
`font_01_sfnt_off0000f63a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF63A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010e51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E51	10904 bytes
SHA-256: `595742eeffdd1eb54c8fa2e39fb3003275780bd14b71aa9e4333081cd931af7e`

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