PDF malware analysis — malicious · cf126b47fb329944

MALICIOUS

PDF

92.5 KB Created: 2021-07-22 10:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: cc6c3f9b5af49a662bccf664c27b8376 SHA-1: 18af498851a936d1d7fde13ff02e9cc65c896e55 SHA-256: cf126b47fb3299444434065d98e81ac5e1e756e17dc0a6af00c83a930d01201b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress sites and utilize link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are identified as IOCs.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://sns.hu/_user/file/wagapuzuporefona.pdf In PDF document text
- http://www.allatpatikapecs.hu/images/file/givufibobubipapoj.pdfIn PDF document text
- http://oxigensupplies.com/shipinc/userfiles/files/lewakesipadopodagiwakalab.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5mfmui93r887hoii2jjhe2q4f3/pomolixexiwavidir.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c4e87b1691da7ed0eb45149710d72f2f/61094752710.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abf3d6c1e5---60161945316.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/96033627532.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bb3010c6cc0f5980202614fb81bbc732/zitalumemugeremakirarede.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f68ee9ee---mudupo.pdfIn PDF document text
- http://moyamoya.center/images/hand_uploaded/files/kixagale.pdfIn PDF document text
- http://autoshiftbid.com/fckeditor/userfiles/file/fekuzuw.pdfIn PDF document text
- http://phantasos.org/userfiles/file/maxozeme.pdfIn PDF document text
- https://dm288.com/slicice/file/9725741792.pdfIn PDF document text
- http://kayamedbursa.com/userfiles/file/zenajukaxidaweza.pdfIn PDF document text
- https://marigabung.com/contents//files/gekoreji.pdfIn PDF document text
- http://youngshiny.com/userfiles/file/1623068316.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c54b388d0---7658576075.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vdpsl1j6s5f524j1sp0g1em27h/7107713653.pdfIn PDF document text
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ieq5ran9n90u54g03ntlstle5l/97771975640.pdfIn PDF document text
- https://aimara-bg.com/userfiles/file/gunidegide.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/771a647d512936fbad04053c5e81af9d/sixigulosolon.pdfIn PDF document text
- https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/3c73f8a21b5708071935efa723002d42/dipuxigizidazevanaxenes.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980407c8487---vifuruxizupedalonaja.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d4af3e2f61564e7dc2ee7d7c0c3f65fe/fafipofa.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/95fbf69e757ee4cf9f9579676b0f7dcc/lusadevavupuvifolonoron.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f48673f3b3c.pdfIn PDF document text
- http://parejalecaros.com/adjunto/upload/fck/files/66507980061.pdfIn PDF document text
- http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/11653560388.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=trig+identities+practice+with+answersPDF 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_off00010499.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10499	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011cb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CB0	10676 bytes
SHA-256: `be04d7aa7d6f411c83168f2b9c0e2e85bbf2154b05804613c1d98b2eb59f944e`
`font_02_sfnt_off000134f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134F1	17844 bytes
SHA-256: `9ef578c2835f44372d54d69b69f0a2b900cef668b15659fc1089aa8cd020a96f`

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