PDF malware analysis — malicious · ab41a914728b9600

MALICIOUS

PDF

98.4 KB Created: 2021-08-07 11:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c9e6985c91cbe05c2daae46f3694c5f8 SHA-1: 8276ff3ec8a3f4b81cd8ec77292b542b7c02f36f SHA-256: ab41a914728b96009caae08a87b1f11201c9d3d95e2c9aff8d2b8a9faba461f2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

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.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/qr1qc8e088apnhn30bahh004q3/suzevevojugapu.pdf In PDF document text
- http://halaljones.com/uploads/files/9968305456.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523022436798164.pdfIn PDF document text
- https://mytalk7.com/_UploadFile/Images/file/11984835029.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3f88aeda---6441079635.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa19f2029---nesevemifatezebora.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af94db83d9b---puvazifutibuzape.pdfIn PDF document text
- http://studiobardinisrl.com/userfiles/files/47249235086.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cbf170548af5cd107363240c2cf9e63f/gojafixawaros.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607be80e85408---89150205480.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160815185e1078---talojux.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e19930aaf72---2579800390.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/45e29003cbbc0e953a7d31437d8b1c56/8154244453.pdfIn PDF document text
- http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/kilulasuvomegerokexanejo.pdfIn PDF document text
- http://ps-chiptuning.hu/userfiles/files/71842385171.pdfIn PDF document text
- http://inannamsao.com/uploads/files/kijiduworoxagufuregilop.pdfIn PDF document text
- https://tourgardan.com/basefile/tourgardancom/files/17138502451.pdfIn PDF document text
- http://liyangah.com/Upload/file/46227303754.pdfIn PDF document text
- http://wksx.top/images/userfiles/file/lazal.pdfIn PDF document text
- http://fisioterapiasuzzara.it/userfiles/files/tunovobiwekaduwirobafi.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bd4d7e30c0df25c58c84dece3ee2b1c3/11480595397.pdfIn PDF document text
- http://aceonlinementors.com/userfiles/file/pudaraxipafexuzinizavu.pdfIn PDF document text
- http://candientushinko.com/images/file/18206242283.pdfIn PDF document text
- http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/kdihn59cecpuqtbm1kro3kn0e6/madiropumoxojafedupenexam.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=answer+sheet+toeic+2017+pdf+downloadPDF 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_off0000ff7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF7D	11128 bytes
SHA-256: `a92f4d760905d3a16fda2e810f73563f944772dcb74f3a9273211a61f68bcacc`
`font_01_sfnt_off0001199c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1199C	26660 bytes
SHA-256: `aa1a1eb117c65c452c86bb302cd82f32b4df399729847931af147f5c72f0a373`
`font_02_sfnt_off0001584d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1584D	2072 bytes
SHA-256: `2e4fcd3508a4eb82cf12a08279e57077ac4ad1fa2a7508f5c90a01018f696ed7`
`font_03_sfnt_off000161b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x161B1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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