PDF malware analysis — malicious · d4428a426ec8f82c

MALICIOUS

PDF

90.0 KB Created: 2021-06-30 06:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 054e386e1a6d5509c571f460e1e386da SHA-1: 8b44f9196315ea1fe9a93e4582b352a3e7b388ac SHA-256: d4428a426ec8f82c8269593cee13e569d22b0df3bd1fb5a9b89a60c7b626265c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the links, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic highlights the use of compromised infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afda395d77---bulozabetitebidi.pdf In PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc6374d04---1619189549.pdfIn PDF document text
- https://nexusmediation.nl/files/fasikuzifokikedirisimegav.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/34bjt46pu1561v7pglh1q33646/jekedefexovudiju.pdfIn PDF document text
- http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/27953785514.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/66517677398.pdfIn PDF document text
- http://accronline.com/userfiles/file/70102495488.pdfIn PDF document text
- https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ca1d6579ff856fa997a1dfee0cce46f2/mujulin.pdfIn PDF document text
- http://haniltm.kr/upfiles/editor/files/64822659575.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700374d0d7f---4382681967.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/91065cf2fdf7828b51f0d8a35adf2e1c/koziwelima.pdfIn PDF document text
- http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/dijolem.pdfIn PDF document text
- http://acpiindia.com/userfiles/file/wizirufitewolegif.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096021d55e7d---69762034111.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a115b23576d---tuxiloj.pdfIn PDF document text
- http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5eibmsibv6fs1b4m8olg55h0d8/49382047356.pdfIn PDF document text
- http://netinflux.net/userfiles/file/36478591904.pdfIn PDF document text
- http://tokyoracing.hu/userfiles/file/53295903806.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160895bc1174fc---6823727464.pdfIn PDF document text
- https://anmoul.com/userfiles/file/35366237647.pdfIn PDF document text
- https://wotfiles.com/ckfinder/userfiles/files/99051702436.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c50910862---15450358315.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/df8bc9dc39243739f0a98d11a0a4f782/16097192884.pdfIn PDF document text
- https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0acbd17ebee2f8a97369ac92a185fba3/saguvod.pdfIn PDF document text
- https://gotoko.com/cmsv2/upload/files/32908096014.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/mo3ri0t57v4r48obogin1arfs7/27386768008.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+many+years+of+law+coursePDF 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_off0000fca1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCA1	17540 bytes
SHA-256: `42fd5569c1e790579ae8d2d72a16ba617e99fa41daf9e550386743298a6b2a7f`
`font_01_sfnt_off00012a31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A31	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014248.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14248	10600 bytes
SHA-256: `01e3c7fc2f2b53a358df08cd1c2c0c7a944cb533b543fa977787670b5c899d59`

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