PDF malware analysis — malicious · 4b3b034dd48a4006

MALICIOUS

PDF

95.4 KB Created: 2021-06-29 14:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b20b618213599cc0395defcad0209ea9 SHA-1: 9db6fbc73d6825c430600a46947f8b03ab54cb4d SHA-256: 4b3b034dd48a4006fae448fee332b54acf2793a5257517d5939bffc06efec907

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The 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, directing users to multiple compromised WordPress upload storage locations and other unknown domains, likely for phishing or malware distribution. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9786

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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aacaa6131---2092804681.pdf In PDF document text
- http://studiotecnicodavico.eu/userfiles/files/8426485559.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9c156ae33d5b442979ed9b51fcc0ecee/fuwejedakajenuzev.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9159b64e---8967883512.pdfIn PDF document text
- http://aylincinarli.com/fckfiles/file/jigexewodiviw.pdfIn PDF document text
- http://orgue-chantepie.info/FCKeditor/upload/file/vefodomemuluviwelovava.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9e663781---dijumolimo.pdfIn PDF document text
- http://alexdisinfestazioni.com/userfiles/files/vikow.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0aa633b4---nobonuwopexi.pdfIn PDF document text
- http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5383c2ba---dogozeruzobezug.pdfIn PDF document text
- https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/281851b38d84922a4f52ea4103498d83/77923473997.pdfIn PDF document text
- http://inspirationforexcellence.com/clients/66491/File/18936783671.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/lmf6519m41tjv9cu5ujrfecuv6/luwurisopipaw.pdfIn PDF document text
- http://bright-mineral.com/uploadfile/file/2021061919432131.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73d919929---69288458723.pdfIn PDF document text
- http://aliceinformaticasrl.com/user/pages/80375195886.pdfIn PDF document text
- https://camgloberealtor.com/userfiles/file/teziwenisorusumaredisu.pdfIn PDF document text
- https://faprosid.com/file/vokokowel.pdfIn PDF document text
- https://bharatbiodiesel.com/userfiles/file/ruxesedowopafobubinikene.pdfIn PDF document text
- http://cedule-plachty.cz/files/file/16463794649.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/180ed68e83398b67052889a074d31c27/22367738780.pdfIn PDF document text
- http://swaminarayangm.org/userfiles/file/57568520923.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3c87n30hjim87e0euuh8h90vvl/39532155758.pdfIn PDF document text
- http://wenxuezj.com/images/File/fefamogupuk.pdfIn PDF document text
- https://clickkedai.com/userfiles/file/deluwipidil.pdfIn PDF document text
- https://aspaeng.com/files/image/files/dutazepenotakagofu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kinetic+friction+acceleration+calculatorPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f948.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF948	16088 bytes
SHA-256: `450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c`
`font_01_sfnt_off00010e7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E7E	10252 bytes
SHA-256: `6c4cafa622f81f8ba5ae26d242d4d8d1ac5ec7a6f23704a83f4975ccea7ce21d`
`font_02_sfnt_off000125a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125A3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013db5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DB5	18808 bytes
SHA-256: `fe099758b235b9d188ed2487ed79735b09f0c09211c2a45a8a1b474e9521d2cd`

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